Install as a non-pew3wm developer

[Olof Bjarnason]

Currently it's only possible to deploy by doing something like this:

$ git clone <repo url>
$ cd pew3wm
$ tox -e deploy

... i.e "developer deploy". We would like an end user UX similar to this:

$ pip install py3status-pewpew
$ <configure your i3status.conf or pewpew!>