Bump to version 0.5.0

Version 0.5.0 adds the following new themes:

* The purple theme by @aalakkad
* The base-16-tomorrow theme by @parnmatt

Author: Tony Crisci

package.json

@@ -27,7 +27,7 @@
     "mocha": "*",
     "chai": "*"
   },
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "Make your i3wm config a little more stylish",
   "devDependencies": {},
   "scripts": {