That's great to quickly show someone a program, but not so great if they try it a few weeks later and get a non-stable version of your program, otherwise that definitely won't be it, they'll have to spend some time figuring out what went wrong.

If Go adds some method to specify a tagged version that could be pretty nice though.

I hope it goes without saying that there's no way this kind of hack (neat as it is) is a substitute for a proper package management system like npm (which is a very good package manager).