enable golint

[dbarrosop]

enabling golint with with golangci-lint requires some extra handling, we need to enable it and fix the issues raised by it. To enable it, make lint should be:

.PHONY: lint
lint:
	docker run \
		--rm \
		-v $(PWD):/go/src/$(PROJECT) \
		-w /go/src/$(PROJECT) \
		golangci/golangci-lint \
			golangci-lint run
	docker run \
		--rm \
		-v $(PWD):/go/src/$(PROJECT) \
		-w /go/src/$(PROJECT) \
		golangci/golangci-lint \
			golangci-lint run --no-config --exclude-use-default=false --disable-all --enable=golint

[nleiva]

I didn't know GolangCI-Lint. I would normally just go with go fmt, so need to learn more about this option before commenting.