Rename git alias ps to pu
Rename git alias ps to pu

This removes the ambiguity between other commands like the unix ps
command and docker ps for example, but unfortunately adds another
ambiguity between pull and push.

Personally I think it still makes sense, if you try to pronounce them,
PUsh is emphasizing the U, and PuLL emphasizes the L more, almost
dropping the U.

alcesleo/dotfiles,alcesleo/dotfiles