diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..bd69cf4
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,17 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.php]
+indent_style = space
+indent_size = 4
+
+[buddy.yml]
+indent_style = space
+indent_size = 2
diff --git a/.gitattributes b/.gitattributes
index fb351a5..8c5b0ac 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,3 +1,3 @@
 /tests export-ignore
 /example export-ignore
-phpunit.xml.dist export-ignore
+phpunit.xml export-ignore
diff --git a/README.md b/README.md
index 2500e82..4666a9e 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 [![Latest Stable Version](https://img.shields.io/packagist/v/whitemerry/phpkin.svg?style=flat-square&label=stable "Latest Stable Version")](https://packagist.org/packages/whitemerry/phpkin) [![OpenTracing Badge](https://img.shields.io/badge/OpenTracing-enabled-blue.svg)](http://opentracing.io)
 [![Maintainability](https://api.codeclimate.com/v1/badges/a785fa78ec069394b21d/maintainability)](https://codeclimate.com/github/whitemerry/phpkin/maintainability)
 [![Test Coverage](https://api.codeclimate.com/v1/badges/a785fa78ec069394b21d/test_coverage)](https://codeclimate.com/github/whitemerry/phpkin/test_coverage)
+[![buddy pipeline](https://app.buddy.works/whitemerry/phpkin/pipelines/pipeline/204054/badge.svg?token=22731a0e88035e9b44c8ffbe93dfbff5f4dd2a91e4c5d0aada37eb55c43c461b "buddy pipeline")](https://app.buddy.works/whitemerry/phpkin/pipelines/pipeline/204054)
 
 First ***production ready***, simple and full Zipkin implementation without dependencies.
 
@@ -161,12 +162,6 @@ For SimpleHttpLogger, short answer, ***yes***
 
 For FileLogger, bit logner answer, you need to upload logs from *zipkin.log* to Zipkin by your own, for example by cron working in background making POST's to the [Zipkin (API)](http://zipkin.io/zipkin-api/#/paths/%252Fspans/post)
 
-## Unit tests
-Code Coverage (Generated by PHPUnit):
-- Lines: 70.35% (140 / 199)
-- Functions and Methods: 52.08% (25 / 48)
-- Classes and Traits: 58.33% (7 / 12)
-
 ## TODO
 - AsyncHttpLogger (Based on CURL)
 - *Upload to zipkin* cron for FileLogger
diff --git a/example/backend/README.md b/example/backend/README.md
index d6dd159..91f5cb7 100644
--- a/example/backend/README.md
+++ b/example/backend/README.md
@@ -3,7 +3,7 @@ Just start application using built-in php server (in this directory)
 ``` bash
 php -S 127.0.0.1:1234
 ```
-Now your aplication is available at [http://127.0.0.1:1234/](http://127.0.0.1:1234/)
+Now your application is available at [http://127.0.0.1:1234/](http://127.0.0.1:1234/)
 
 Make sure your Zipkin's application is up on `127.0.0.1:9411`.
 
@@ -11,4 +11,4 @@ If you have other ip/port just modify index.php at line 27.
 
 ### Are you getting error?
 - Fatal error: Uncaught whitemerry\phpkin\Logger\LoggerException: Trace upload failed
-   * Zipkin's URL is invalid at line 27 in index.php
\ No newline at end of file
+   * Zipkin's URL is invalid at line 27 in index.php
diff --git a/example/backend/index.php b/example/backend/index.php
index 8e4983f..df12659 100644
--- a/example/backend/index.php
+++ b/example/backend/index.php
@@ -25,7 +25,7 @@
  * Make sure host is available with http:// and port because SimpleHttpLogger does not throw error on failure
  * For debug purposes you can disable muteErrors
  */
-$logger = new SimpleHttpLogger(['host' => 'http://127.0.0.1:9411', 'muteErrors' => false]);
+$logger = new SimpleHttpLogger(array('host' => 'http://127.0.0.1:9411', 'muteErrors' => false));
 
 /**
  * Read headers
@@ -60,16 +60,16 @@
 $spanId = new SpanIdentifier();
 
 // Context for file_get_contents for passing headers (B3 propagation)
-$context = stream_context_create([
-    'http' => [
+$context = stream_context_create(array(
+    'http' => array(
         'method' => 'GET',
         'header' =>
             'X-B3-TraceId: ' . TracerInfo::getTraceId() . "\r\n" .
             'X-B3-SpanId: ' . ((string) $spanId) . "\r\n" .
             'X-B3-ParentSpanId: ' . TracerInfo::getTraceSpanId() . "\r\n" .
             'X-B3-Sampled: ' . ((int) TracerInfo::isSampled()) . "\r\n"
-    ]
-]);
+    )
+));
 
 $request = file_get_contents($url, false, $context);
 
diff --git a/example/frontend/README.md b/example/frontend/README.md
index 3176535..0821d72 100644
--- a/example/frontend/README.md
+++ b/example/frontend/README.md
@@ -3,7 +3,7 @@ Just start application using built-in php server (in this directory)
 ``` bash
 php -S 127.0.0.1:1234
 ```
-Now your aplication is available at [http://127.0.0.1:1234/](http://127.0.0.1:1234/)
+Now your application is available at [http://127.0.0.1:1234/](http://127.0.0.1:1234/)
 
 Make sure your Zipkin's application is up on `127.0.0.1:9411`.
 
@@ -11,4 +11,4 @@ If you have other ip/port just modify index.php at line 27.
 
 ### Are you getting error?
 - Fatal error: Uncaught whitemerry\phpkin\Logger\LoggerException: Trace upload failed
-   * Zipkin's URL is invalid at line 27 in index.php
\ No newline at end of file
+   * Zipkin's URL is invalid at line 27 in index.php
diff --git a/example/frontend/index.php b/example/frontend/index.php
index 4f54e81..795846b 100644
--- a/example/frontend/index.php
+++ b/example/frontend/index.php
@@ -24,7 +24,7 @@
  * Make sure host is available with http:// and port because SimpleHttpLogger does not throw error on failure
  * For debug purposes you can disable muteErrors
  */
-$logger = new SimpleHttpLogger(['host' => 'http://127.0.0.1:9411', 'muteErrors' => false]);
+$logger = new SimpleHttpLogger(array('host' => 'http://127.0.0.1:9411', 'muteErrors' => false));
 
 /**
  * And create tracer object, if you want to have statically access just initialize TracerProxy
@@ -40,16 +40,16 @@
 $spanId = new SpanIdentifier();
 
 // Context for file_get_contents for passing headers (B3 propagation)
-$context = stream_context_create([
-    'http' => [
+$context = stream_context_create(array(
+    'http' => array(
         'method' => 'GET',
         'header' =>
             'X-B3-TraceId: ' . TracerInfo::getTraceId() . "\r\n" .
             'X-B3-SpanId: ' . ((string) $spanId) . "\r\n" .
             'X-B3-ParentSpanId: ' . TracerInfo::getTraceSpanId() . "\r\n" .
             'X-B3-Sampled: ' . ((int) TracerInfo::isSampled()) . "\r\n"
-    ]
-]);
+    )
+));
 
 $request = file_get_contents($url, false, $context);
 
diff --git a/src/AnnotationBlock.php b/src/AnnotationBlock.php
index 484f655..411f113 100644
--- a/src/AnnotationBlock.php
+++ b/src/AnnotationBlock.php
@@ -76,18 +76,18 @@ public function getStartTimestamp()
      */
     public function toArray()
     {
-        return [
-            [
+        return array(
+            array(
                 'endpoint' => $this->endpoint->toArray(),
                 'timestamp' => $this->startTimestamp,
                 'value' => $this->values[0]
-            ],
-            [
+            ),
+            array(
                 'endpoint' => $this->endpoint->toArray(),
                 'timestamp' => $this->endTimestamp,
                 'value' => $this->values[1]
-            ]
-        ];
+            )
+        );
     }
 
     /**
@@ -101,10 +101,10 @@ protected function setValues($type)
     {
         switch ($type) {
             case static::CLIENT:
-                $this->values = ['cs', 'cr'];
+                $this->values = array('cs', 'cr');
                 break;
             case static::SERVER:
-                $this->values = ['sr', 'ss'];
+                $this->values = array('sr', 'ss');
                 break;
             default:
                 throw new \InvalidArgumentException('$type must be TYPE_CLIENT or TYPE_SERVER');
diff --git a/src/Endpoint.php b/src/Endpoint.php
index 507d717..409bad3 100644
--- a/src/Endpoint.php
+++ b/src/Endpoint.php
@@ -45,11 +45,11 @@ public function __construct($serviceName, $ip, $port = '80')
      */
     public function toArray()
     {
-        return [
+        return array(
             'serviceName' => $this->serviceName,
             'ipv4' => $this->ip,
             'port' => $this->port
-        ];
+        );
     }
 
     /**
diff --git a/src/Logger/FileLogger.php b/src/Logger/FileLogger.php
index 8f7197d..6f62c55 100644
--- a/src/Logger/FileLogger.php
+++ b/src/Logger/FileLogger.php
@@ -24,13 +24,14 @@ class FileLogger implements Logger
      * @param $options array See above
      *
      * @throws \BadMethodCallException
+     * @throws LoggerException
      */
     public function __construct($options = [])
     {
-        $defaults = [
+        $defaults = array(
             'path' => 'tmp' . DIRECTORY_SEPARATOR,
             'fileName' => 'zipkin.log'
-        ];
+        );
 
         $this->options = array_merge($defaults, $options);
 
@@ -50,4 +51,4 @@ public function trace($spans)
             FILE_APPEND | LOCK_EX
         );
     }
-}
\ No newline at end of file
+}
diff --git a/src/Logger/Logger.php b/src/Logger/Logger.php
index 38b855c..5da1090 100644
--- a/src/Logger/Logger.php
+++ b/src/Logger/Logger.php
@@ -14,10 +14,10 @@ interface Logger
      *
      * @param $options
      */
-    public function __construct($options = []);
+    public function __construct($options = array());
 
     /**
      * @param $spans array
      */
     public function trace($spans);
-}
\ No newline at end of file
+}
diff --git a/src/Logger/SimpleHttpLogger.php b/src/Logger/SimpleHttpLogger.php
index cc4aa9d..bac03fd 100644
--- a/src/Logger/SimpleHttpLogger.php
+++ b/src/Logger/SimpleHttpLogger.php
@@ -29,29 +29,31 @@ class SimpleHttpLogger implements Logger
      */
     public function __construct($options = [])
     {
-        $defaults = [
+        $defaults = array(
             'host' => 'http://127.0.0.1:9144',
             'endpoint' => '/api/v1/spans',
             'muteErrors' => true,
-            'contextOptions' => []
-        ];
+            'contextOptions' => array()
+        );
 
         $this->options = array_merge($defaults, $options);
     }
 
     /**
      * @inheritdoc
+     *
+     * @throws LoggerException
      */
     public function trace($spans)
     {
-        $contextOptions = [
-            'http' => [
+        $contextOptions = array(
+            'http' => array(
                 'method' => 'POST',
                 'header' => 'Content-type: application/json',
                 'content' => json_encode($spans),
                 'ignore_errors' => true
-            ]
-        ];
+            )
+        );
         $context = stream_context_create(array_merge_recursive($contextOptions, $this->options['contextOptions']));
         @file_get_contents($this->options['host'] . $this->options['endpoint'], false, $context);
 
@@ -66,6 +68,8 @@ public function trace($spans)
     /**
      * Search for 202 header
      *
+     * @param $headers array
+     *
      * @return bool
      */
     protected function validResponse($headers)
diff --git a/src/Metadata.php b/src/Metadata.php
index f8c128d..3bae34a 100644
--- a/src/Metadata.php
+++ b/src/Metadata.php
@@ -68,7 +68,7 @@ class Metadata
     /**
      * @var array[]
      */
-    protected $annotations = [];
+    protected $annotations = array();
 
     /**
      * Set meta annotation
@@ -88,10 +88,10 @@ public function set($key, $value)
             throw new \InvalidArgumentException('$value must be string, int or bool');
         }
 
-        $this->annotations[] = [
+        $this->annotations[] = array(
             'key' => $key,
             'value' => (string) $value
-        ];
+        );
     }
 
     /**
diff --git a/src/Sampler/PercentageSampler.php b/src/Sampler/PercentageSampler.php
index adf2f38..01415ff 100644
--- a/src/Sampler/PercentageSampler.php
+++ b/src/Sampler/PercentageSampler.php
@@ -22,11 +22,11 @@ class PercentageSampler implements Sampler
      *
      * @param $options array See above
      */
-    public function __construct($options = [])
+    public function __construct($options = array())
     {
-        $defaults = [
+        $defaults = array(
             'percents' => 50
-        ];
+        );
 
         $this->options = array_merge($defaults, $options);
     }
diff --git a/src/Sampler/Sampler.php b/src/Sampler/Sampler.php
index 0fe999a..cc88383 100644
--- a/src/Sampler/Sampler.php
+++ b/src/Sampler/Sampler.php
@@ -14,7 +14,7 @@ interface Sampler
      *
      * @param array $options
      */
-    public function __construct($options = []);
+    public function __construct($options = array());
 
     /**
      * Returns calculated flag
@@ -22,4 +22,4 @@ public function __construct($options = []);
      * @return bool
      */
     public function isSampled();
-}
\ No newline at end of file
+}
diff --git a/src/Span.php b/src/Span.php
index cb44280..0680290 100644
--- a/src/Span.php
+++ b/src/Span.php
@@ -51,7 +51,7 @@ class Span
      * @param $traceId Identifier Trace identifier (default from TraceInfo::getTraceId())
      * @param $parentId Identifier Parent identifier (default from TraceInfo::getTraceSpanId())
      */
-    function __construct(
+    public function __construct(
         $id,
         $name,
         $annotationBlock,
@@ -64,8 +64,10 @@ function __construct(
         $this->setName($name);
         $this->setAnnotationBlock($annotationBlock);
         $this->setMetadata($metadata);
-        $this->setIdentifier('traceId', $traceId, [TracerInfo::class, 'getTraceId']);
-        $this->setIdentifier('parentId', $parentId, [TracerInfo::class, 'getTraceSpanId']);
+
+        # FIXME: Class name constant is available in PHP 5.5 only
+        $this->setIdentifier('traceId', $traceId, array(TracerInfo::class, 'getTraceId'));
+        $this->setIdentifier('parentId', $parentId, array(TracerInfo::class, 'getTraceSpanId'));
     }
 
     /**
@@ -75,14 +77,14 @@ function __construct(
      */
     public function toArray()
     {
-        $span = [
+        $span = array(
             'id' => (string) $this->id,
             'traceId' => (string) $this->traceId,
             'name' => $this->name,
             'timestamp' => $this->annotationBlock->getStartTimestamp(),
             'duration' => $this->annotationBlock->getDuration(),
             'annotations' => $this->annotationBlock->toArray()
-        ];
+        );
 
         if ($this->parentId !== null) {
             $span['parentId'] = (string) $this->parentId;
diff --git a/src/Tracer.php b/src/Tracer.php
index 9f96fdf..585c58a 100644
--- a/src/Tracer.php
+++ b/src/Tracer.php
@@ -39,7 +39,7 @@ class Tracer
     /**
      * @var Span[]
      */
-    protected $spans = [];
+    protected $spans = array();
 
     /**
      * @var string
diff --git a/src/TracerInfo.php b/src/TracerInfo.php
index 786c75a..debc437 100644
--- a/src/TracerInfo.php
+++ b/src/TracerInfo.php
@@ -39,6 +39,8 @@ class TracerInfo
     public static function init($sampler, $traceId, $traceSpanId)
     {
         static::setSampled($sampler);
+
+        # FIXME: Class name constant is available in PHP 5.5 only
         static::setIdentifier('traceId', $traceId, TraceIdentifier::class);
         static::setIdentifier('traceSpanId', $traceSpanId, SpanIdentifier::class);
     }
diff --git a/src/TracerProxy.php b/src/TracerProxy.php
index daa4438..3469397 100644
--- a/src/TracerProxy.php
+++ b/src/TracerProxy.php
@@ -28,6 +28,8 @@ public static function init($instance)
 
     /**
      * @see Tracer::addSpan($span)
+     *
+     * @param $span Span
      */
     public static function addSpan($span)
     {
diff --git a/tests/AnnotationBlockTestCase.php b/tests/AnnotationBlockTestCase.php
index 7f985bc..ae372e6 100644
--- a/tests/AnnotationBlockTestCase.php
+++ b/tests/AnnotationBlockTestCase.php
@@ -63,6 +63,7 @@ public function shouldCreateWithEndTime()
     public function shouldFailOnType()
     {
         // given
+        # FIXME: Class name constant is available in PHP 5.5 only
         $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionMessageRegExp('/\$type/');
 
@@ -83,6 +84,7 @@ public function shouldFailOnType()
     public function shouldFailOnEndpoint()
     {
         // given
+        # FIXME: Class name constant is available in PHP 5.5 only
         $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionMessageRegExp('/\$endpoint/');
 
@@ -101,6 +103,7 @@ public function shouldFailOnEndpoint()
     public function shouldFailOnTimestamp()
     {
         // given
+        # FIXME: Class name constant is available in PHP 5.5 only
         $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionMessageRegExp('/startTimestamp/');
 
diff --git a/tests/EndpointTestCase.php b/tests/EndpointTestCase.php
index 4ec17e7..7ca1ff6 100644
--- a/tests/EndpointTestCase.php
+++ b/tests/EndpointTestCase.php
@@ -40,6 +40,7 @@ public function shouldCreate()
     public function shouldFailOnName()
     {
         // given
+        # FIXME: Class name constant is available in PHP 5.5 only
         $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionMessageRegExp('/\$serviceName/');
 
@@ -55,6 +56,7 @@ public function shouldFailOnName()
     public function shouldFailOnIp()
     {
         // given
+        # FIXME: Class name constant is available in PHP 5.5 only
         $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionMessageRegExp('/\$ip/');
 
@@ -70,6 +72,7 @@ public function shouldFailOnIp()
     public function shouldFailOnPort()
     {
         // given
+        # FIXME: Class name constant is available in PHP 5.5 only
         $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionMessageRegExp('/\$port/');
 
diff --git a/tests/MetadataTestCase.php b/tests/MetadataTestCase.php
index 5c1d247..f9875f6 100644
--- a/tests/MetadataTestCase.php
+++ b/tests/MetadataTestCase.php
@@ -17,12 +17,12 @@ class MetadataTestCase extends \PHPUnit_Framework_TestCase
     public function shouldCreate()
     {
         // given
-        $data = [
-            ['part', 'basket'],
-            ['cabinet', false],
-            ['perform', 'race'],
-            ['chain', 1997]
-        ];
+        $data = array(
+            array('part', 'basket'),
+            array('cabinet', false),
+            array('perform', 'race'),
+            array('chain', 1997)
+        );
 
         // when
         $metadata = new Metadata();
@@ -45,6 +45,7 @@ public function shouldCreate()
     public function shouldFailOnKey()
     {
         // given
+        # FIXME: Class name constant is available in PHP 5.5 only
         $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionMessageRegExp('/\$key/');
 
@@ -63,6 +64,7 @@ public function shouldFailOnKey()
     public function shouldFailOnValue()
     {
         // given
+        # FIXME: Class name constant is available in PHP 5.5 only
         $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionMessageRegExp('/\$value/');
 
diff --git a/tests/Mocker.php b/tests/Mocker.php
index 3b08727..11c484f 100644
--- a/tests/Mocker.php
+++ b/tests/Mocker.php
@@ -23,7 +23,7 @@ public static function initTracer()
         new Tracer(
             'hut',
             static::getEndpoint(),
-            new FileLogger(['path' => './'])
+            new FileLogger(array('path' => './'))
         );
     }
 
diff --git a/tests/Sampler/PercentageSamplerTestCase.php b/tests/Sampler/PercentageSamplerTestCase.php
index 386d84e..bce1ccb 100644
--- a/tests/Sampler/PercentageSamplerTestCase.php
+++ b/tests/Sampler/PercentageSamplerTestCase.php
@@ -20,7 +20,7 @@ public function shouldCalculate()
         $percents = 51;
 
         // when
-        $sampler = new PercentageSampler(['percents' => $percents]);
+        $sampler = new PercentageSampler(array('percents' => $percents));
 
         // then
         $this->assertTrue(is_bool($sampler->isSampled()));
@@ -35,7 +35,7 @@ public function shouldNotBeSampled()
         $percents = 0;
 
         // when
-        $sampler = new PercentageSampler(['percents' => $percents]);
+        $sampler = new PercentageSampler(array('percents' => $percents));
 
         // then
         $this->assertFalse($sampler->isSampled());
@@ -50,9 +50,9 @@ public function shouldBeSampled()
         $percents = 100;
 
         // when
-        $sampler = new PercentageSampler(['percents' => $percents]);
+        $sampler = new PercentageSampler(array('percents' => $percents));
 
         // then
         $this->assertTrue($sampler->isSampled());
     }
-}
\ No newline at end of file
+}