Support self-updating?

[avamsi]

We could probably do this automatically? But maybe not, in the interest of startup time.

[avamsi]

Another way to approach this would probably be a gobin "package manager" for go install ...s.

[avamsi]

Looks like there are some selfupdate packages available but we could probably just run go install with the module from (debug) buildinfo? Need to handle devel binaries explicitly, though.

[avamsi]

Maybe we could start a goroutine to check for updates and tie it back at the end (of the program)? Need to figure out a way to not do that all the time, though -- seems wasteful (unlike say, brew).