Rename release alias to avoid collision with elixir 1.9 mix release

[mracos]

With the release mix command introduced in Elixir 1.9, we should probably change the command that releases a new version of the lib to something like publish (?) as to avoid collision with the official mix command and to lessen the possibility of confusion for newcomers. 😄

[tmbb]

Yes, I think we should. I had no idea there was a new "release command". But I'm not sure whether publish is the best name.

[antedeguemon]

@tmbb the issue was fixed by this commit.

[mracos]

Tks for the heads up @antedeguemon!