Makefile help macro for self documenting Makefiles

Makefile

## Add the "help" target as the first target in your makefile. Then, any target
## that is marked up with a double hash as shown will display as a help message
## when you type just "make" or "make help"

help:
	@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'

my_target: ## This target does a thing
  echo "hello"

clean: ## This cleans things up
  echo "Sweepy sweep"