test with go-1.16, use linter action, fix linter issues (#66)

.github/workflows/build.yml

@@ -1,26 +1,28 @@
 name: build
-on: [push]
+
+on:
+  push
+
 jobs:
 
   build:
     name: Build
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.14
+    - name: Set up Go 1.16
       uses: actions/setup-go@v2
       with:
-        go-version: 1.14
+        go-version: 1.16
       id: go
 
     - name: Check out code into the Go module directory
       uses: actions/checkout@v2
 
-    - name: Install golangci-lint
-      run: curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh| sh -s -- -b $(go env GOPATH)/bin v1.27.0
-
-    - name: Run golangci-lint
-      run: $(go env GOPATH)/bin/golangci-lint run
+    - name: Lint
+      uses: golangci/golangci-lint-action@v2
+      with:
+        args: -p bugs -p unused
 
     - name: Build
       run: make test

go.mod

@@ -5,13 +5,13 @@ go 1.16
 require (
 	github.com/emicklei/go-restful/v3 v3.5.1
 	github.com/go-openapi/errors v0.20.0
-	github.com/go-openapi/runtime v0.19.28
+	github.com/go-openapi/runtime v0.19.29
 	github.com/go-openapi/strfmt v0.20.1
 	github.com/go-openapi/swag v0.19.15
 	github.com/go-openapi/validate v0.20.2
-	github.com/metal-stack/masterdata-api v0.8.5
-	github.com/metal-stack/metal-lib v0.7.2
+	github.com/metal-stack/masterdata-api v0.8.7
+	github.com/metal-stack/metal-lib v0.8.0
 	github.com/metal-stack/security v0.5.3
 	github.com/stretchr/testify v1.7.0
-	github.com/tidwall/pretty v1.1.0 // indirect
+	github.com/tidwall/pretty v1.2.0 // indirect
 )