Fix github url in package.json

package.json

@@ -2,7 +2,7 @@
     "name": "amdefine",
     "description": "Provide AMD's define() API for declaring modules in the AMD format",
     "version": "0.0.4",
-    "homepage": "http://github.com/jrburke/amdefine.js",
+    "homepage": "http://github.com/jrburke/amdefine",
     "author": "James Burke <jrburke@gmail.com> (http://github.com/jrburke)",
     "licenses": [
         {