Makefile: use golangci-lint instead of golint

It includes golint and also has a lot of other useful linters.

.circleci/config.yml

@@ -41,8 +41,8 @@ jobs:
       - run:
           name: go-lint
           command: |
-            go get -u -v golang.org/x/lint/golint
-            golint -set_exit_status ./...
+            curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.40.0
+            make lint
 
   vet:
     working_directory: /go/src/github.com/nspcc-dev/neo-go

.github/workflows/run_tests.yml

@@ -16,29 +16,14 @@ env:
 jobs:
   lint:
     name: Lint
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v2
-
-      - name: Set up Go
-        uses: actions/setup-go@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
         with:
-          go-version: 1.16
-
-      - name: Restore Go modules from cache
-        uses: actions/cache@v2
-        with:
-          path: /home/runner/go/pkg/mod
-          key: deps-${{ hashFiles('go.sum') }}
-
-      - name: Update Go modules
-        run: go mod download -json
-
-      - name: Run linter
-        run: |
-          go get -u -v golang.org/x/lint/golint
-          make lint
+          version: latest
 
   vet:
     name: Vet

Makefile

@@ -84,7 +84,7 @@ vet:
 	@go vet ./...
 
 lint:
-	@go list ./... | xargs -L1 golint -set_exit_status
+	@golangci-lint run
 
 fmt:
 	@gofmt -l -w -s $$(find . -type f -name '*.go'| grep -v "/vendor/")