Updated description and bump'd version

Signed-off-by: French Ben <frenchben@docker.com>

package.json

@@ -2,7 +2,7 @@
   "name": "Kitematic",
   "version": "0.12.1",
   "author": "Kitematic",
-  "description": "Simple Docker Container management for Mac OS X.",
+  "description": "Simple Docker Container management for Mac OS X, Windows and Ubuntu.",
   "homepage": "https://kitematic.com/",
   "main": "browser.js",
   "repository": {