Update includes

[tj]

Need a way to refresh the contents

[rpunkfu]

Maybe store a dotfile with timestamp of last update in folder where github dependency is downloaded and when we run mmake it decides whether to check git for newer version and fetches if found? Let me know what you think, I'll probably have some time to implement this over the weekend :)

[tj]

Currently it skips if there's already something local (https://github.com/tj/mmake/blob/master/installer/installer.go#L119), so we wouldn't be able to compare without adding a bit of extra latency each time.

It might not be horrible to leave it as make update or something manual so it doesn't scare people magically fetching potentially new/malicious code haha. With that I guess we'd only need an Installer field to bypass the stat().

[rpunkfu]

Yeah, manual option would be nicer, maybe just force flag for installDependency would be enough, dunno ;)