upgrade to jts 1.16.0 and protobuf-java 3.6.1

.travis.yml

@@ -1,6 +1,6 @@
 language: java
 jdk:
-  - oraclejdk8
+  - openjdk8
 install: true
 script: mvn clean test
 cache:

pom.xml

@@ -152,14 +152,14 @@
         <dependency>
             <groupId>com.google.protobuf</groupId>
             <artifactId>protobuf-java</artifactId>
-            <version>3.5.1</version>
+            <version>3.6.1</version>
         </dependency>
 
         <!-- Geometry model -->
         <dependency>
             <groupId>org.locationtech.jts</groupId>
             <artifactId>jts-core</artifactId>
-            <version>1.15.1</version>
+            <version>1.16.0</version>
         </dependency>
 
         <!-- Testing -->

src/test/java/com/wdtinc/mapbox_vector_tile/adapt/jts/MvtReaderTest.java

@@ -28,10 +28,9 @@
 public final class MvtReaderTest {
 
     private static final double DOUBLE_DELTA = 1e-10;
-
-    private static final int NUMBER_OF_DIMENSIONS = 2;
+
     private static final int SRID = 0;
-    
+
     @Test
     public void testLayers() {
         try {
@@ -147,11 +146,10 @@ private static JtsMvt loadMvt(String file,
                 new TagKeyValueMapConverter(),
                 ringClassifier);
     }
-    
+
     private static GeometryFactory createGeometryFactory() {
         final PrecisionModel precisionModel = new PrecisionModel();
-        final PackedCoordinateSequenceFactory coordinateSequenceFactory = 
-                new PackedCoordinateSequenceFactory(PackedCoordinateSequenceFactory.DOUBLE, NUMBER_OF_DIMENSIONS);
+        final PackedCoordinateSequenceFactory coordinateSequenceFactory = new PackedCoordinateSequenceFactory();
         return new GeometryFactory(precisionModel, SRID, coordinateSequenceFactory);
     }
 }