package.json: Update contact info

[ci skip]

Author: cvrebert

package.json

@@ -3,7 +3,7 @@
   "description": "Grunt plugin for Twitter's css-flip",
   "version": "0.4.0",
   "homepage": "https://github.com/twbs/grunt-css-flip",
-  "author": "Chris Rebert <code@rebertia.com> (http://chrisrebert.com)",
+  "author": "Chris Rebert <code@chrisrebert.com> (http://chrisrebert.com)",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/twbs/grunt-css-flip.git"