package.json: fix duplicate scripts property.

[skip sauce]
[skip validator]

package.json

@@ -14,6 +14,7 @@
   "homepage": "http://getbootstrap.com",
   "author": "Twitter, Inc.",
   "scripts": {
+    "change-version": "node grunt/change-version.js",
     "test": "grunt test"
   },
   "style": "dist/css/bootstrap.css",
@@ -96,8 +97,5 @@
     "dependencies": {
       "jquery": "*"
     }
-  },
-  "scripts": {
-    "change-version": "node grunt/change-version.js"
   }
 }