Set up golangci-lint

.github/workflows/lint.yml

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+name: Lint
+
+on: push
+
+jobs:
+  run-linters:
+    name: Run linters
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v2
+
+      - name: Set up Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.14
+
+      - name: Run golangci-lint
+        run: docker run --rm -v $(pwd):/app -w /app golangci/golangci-lint:v1.24.0 golangci-lint run

.golangci.yml

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+output:
+  print-issued-lines: false
+
+linters:
+  enable-all: true
+  disable:
+    - funlen
+    - gochecknoglobals
+    - gocognit
+    - gomnd
+    - maligned
+    - wsl
+
+linters-settings:
+  lll:
+    max-length: 100
+    tab-width: 2
+
+issues:
+  max-per-linter: 0
+  max-same: 0
+  exclude-use-default: false
+  exclude:
+    - "Line contains TODO/BUG/FIXME"