Update README.md
Merge branch 'master' into develop

Merge master
Merge branch 'develop' of https://github.com/HarveyHunt/i3situation into develop

Conflicts:
	README.md

fix
Added an example config file.
Fixed the slow updating output (Huge props to Kushou from IRC for solving it) and added a cmus plugin.
Bumped to version 4.0.1 after the bugfix by Kushou on #i3 IRC. Added
documentation for the cmus.py plugin, also.
Merge branch 'develop'

Merge in 4.0.1 release.
Merge branch 'master' of https://github.com/HarveyHunt/i3situation

Conflicts:
	README.md

Fixed README conflict