Print commands when running 'make lint'

Issues: #19

Makefile

@@ -4,11 +4,11 @@ help:   ## Print help text.
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
 
 lint:   ## Check code using various linters and static checkers.
-	@gofmt -d .
-	@go vet -v . || exit 1
-	@golint -set_exit_status . || exit 1
-	@errcheck -ignoretests || exit 1
-	@misspell -locale uk .
+	gofmt -d .
+	go vet -v . || exit 1
+	golint -set_exit_status . || exit 1
+	errcheck -ignoretests || exit 1
+	misspell -locale uk .
 
 install: ## Install or update development dependencies.
 	@go get -u github.com/stretchr/testify/assert