Add hub's completion file
Add hub's completion file

This uses the version at commit 35c76bf (2015-12-08)
https://github.com/github/hub/commit/35c76bf91dc3d699173599464b9b41cb877ee440

skriptble/oh-my-zsh,skriptble/oh-my-zsh,skriptble/oh-my-zsh,skriptble/oh-my-zsh