Mark the `version` command as being a git extension
Mark the `version` command as being a git extension

This prevents it from showing up under custom commands in `hub help -a`

tomasv/hub,cpick/hub,github/hub,github/hub,rlugojr/hub,github/hub,github/hub,cpick/hub,rlugojr/hub,tomasv/hub,cpick/hub,tomasv/hub,rlugojr/hub