Replace gometalinter -> golangci-lint

CONTRIBUTING.md

@@ -15,7 +15,8 @@ If you choose to contribute code, please review the [pull request template](http
 
 Fork and clone the repo.
 
-[Install go](https://golang.org/doc/install#install). On macOS running Homebrew, `brew install go` is easier than the linked instructions.
+[Install go](https://golang.org/doc/install#install). On macOS running Homebrew,
+`brew install go` is easier than the linked instructions.
 
 Install package dependencies and development tools:
 
@@ -24,6 +25,9 @@ make setup
 go get -t ./...
 ```
 
+[Install golangci-lint](https://golangci-lint.run/usage/install/#local-installation).
+On macOS: `brew install golangci-lint`
+
 ### Test and Lint
 
 ```bash

Makefile

@@ -38,14 +38,12 @@ release: build
 setup:
 	go mod init || true
 	go get -t -u ./...
-	go get github.com/alecthomas/gometalinter
-	gometalinter --install
 
 install:
 	go install ${LDFLAGS} ${PACKAGE}
 
 lint:
-	gometalinter ./... --tests --deadline=5m --disable=gotype --disable=aligncheck
+	golangci-lint run
 
 test:
 	go test ./...

cache/cache.go

@@ -46,7 +46,7 @@ func Disable() {
 // header and content are distinct parameters to relieve the caller from
 // having to concatenate them.
 func WithFile(header string, content string, fn func() (string, error)) (string, error) {
-	h := md5.New()             // nolint: gas, noncrypto
+	h := md5.New()             // nolint: gas
 	io.WriteString(h, content) // nolint: errcheck, gas
 	io.WriteString(h, "\n")    // nolint: errcheck, gas
 	io.WriteString(h, header)  // nolint: errcheck, gas

renderers/sass.go

@@ -30,7 +30,7 @@ func (p *Manager) copySASSFileIncludes() error {
 	if err := p.makeSASSTempDir(); err != nil {
 		return err
 	}
-	h := md5.New() // nolint: gas, noncrypto
+	h := md5.New() // nolint: gas
 	if p.ThemeDir != "" {
 		if err := p.copySASSFiles(filepath.Join(p.ThemeDir, sassDirName), p.sassTempDir, h); err != nil {
 			return err