Add .golangci.yml

.golangci.yml

@@ -0,0 +1,40 @@
+run:
+  timeout: 5m
+
+linters:
+  enable:
+    - errname
+    - exhaustive
+    - exportloopref
+    - gci
+    - goconst
+    - godot
+    - gofmt
+    - makezero
+    - unconvert
+    - unparam
+    - whitespace
+
+linters-settings:
+  exhaustive:
+    default-signifies-exhaustive: true
+  goconst:
+    min-len: 2
+    min-occurrences: 2
+  gofmt:
+    rewrite-rules:
+      - pattern: interface{}
+        replacement: any
+  govet:
+    enable-all: true
+    disable:
+      - fieldalignment
+      - shadow
+  makezero:
+    always: false
+
+issues:
+  exclude-rules:
+    - path: _test\.go$
+      linters:
+        - goconst

flag_test.go

@@ -1,7 +1,10 @@
 package main
 
-import "testing"
-import "github.com/google/go-cmp/cmp"
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
 
 func TestRecoveryLevel_Set(t *testing.T) {
 	assertLevel := func(t *testing.T, want recoveryLevel, s string) {