tweak composer

Author: Shawn McCool

composer.json

@@ -13,12 +13,6 @@
       "homepage": "http://heybigname.com/"
     }
   ],
-  "repositories": [
-    {
-      "type": "git",
-      "url": "https://github.com/backup-manager/backup-manager"
-    }
-  ],
   "require": {
     "heybigname/backup-manager": "1.0",
     "php": ">=5.4.0",