add homepage property to package.json

package.json

@@ -3,6 +3,7 @@
   "version": "2.1.1",
   "description": "Logic-less {{mustache}} templates with JavaScript",
   "author": "mustache.js Authors <http://github.com/janl/mustache.js>",
+  "homepage": "https://github.com/janl/mustache.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/janl/mustache.js.git"