run golangci-lint as GitHub Action

Author: willnorris

Diff for: .github/workflows/linter.yml

@@ -0,0 +1,18 @@
+on: [push, pull_request]
+name: linter
+
+jobs:
+  lint:
+    strategy:
+      matrix:
+        go-version: [1.x]
+        platform: [ubuntu-latest]
+    runs-on: ${{ matrix.platform }}
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: golangci-lint
+      uses: golangci/golangci-lint-action@v2
+      with:
+        version: v1.32

Diff for: .golangci.yml

@@ -0,0 +1,13 @@
+linters:
+  enable:
+    - dogsled
+    - dupl
+    - gofmt
+    - goimports
+    - gosec
+    - misspell
+    - nakedret
+    - stylecheck
+    - unconvert
+    - unparam
+    - whitespace

Diff for: query/encode_test.go

@@ -368,7 +368,6 @@ func TestIsEmptyValue(t *testing.T) {
 		want := tt.empty
 		if got != want {
 			t.Errorf("isEmptyValue(%v) returned %t; want %t", tt.value, got, want)
-
 		}
 	}
 }