Add GitHub Actions, fix a lint

.github/workflows/lint.yaml

@@ -0,0 +1,21 @@
+name: Lint
+on: [push, pull_request]
+jobs:
+  lint:
+    strategy:
+      matrix:
+        go:
+          - stable
+          - oldstable
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v3
+
+      - name: Setup Go ${{ matrix.go }}
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@v3

.github/workflows/test.yaml

@@ -0,0 +1,21 @@
+name: Test
+on: [push, pull_request]
+jobs:
+  lint:
+    strategy:
+      matrix:
+        go:
+          - stable
+          - oldstable
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v3
+
+      - name: Setup Go ${{ matrix.go }}
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: Run tests
+        run: go test -v ./...

chain_test.go

@@ -14,7 +14,7 @@ import (
 func tagMiddleware(tag string) Constructor {
 	return func(h http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			w.Write([]byte(tag))
+			_, _ = w.Write([]byte(tag))
 			h.ServeHTTP(w, r)
 		})
 	}
@@ -29,7 +29,7 @@ func funcsEqual(f1, f2 interface{}) bool {
 }
 
 var testApp = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-	w.Write([]byte("app\n"))
+	_, _ = w.Write([]byte("app\n"))
 })
 
 func TestNew(t *testing.T) {