Mention the use of golangci-lint

While staticcheck and gosec tends to catch a lot of stuff, sometimes
golangci-lint will find some additional issue so "why not both".

README.md

@@ -94,6 +94,7 @@ run at the top level directory prior to commiting:
 * `go vet ./...`
 * `staticcheck ./...` (see [staticcheck](https://staticcheck.io))
 * `gosec ./...` (see [gosec](https://github.com/securego/gosec))
+* `golangci-lint run` (see [golangci-lint](https://golangci-lint.run))
 * `go test ./...`
 
 If you have modified the Swagger comments you need to regenerate the