package: add repository URL

Author: Miroslav Bajtoš

package.json

@@ -17,6 +17,10 @@
     "chai": "~1.9.0",
     "loopback": "^1.6.1"
   },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/strongloop/loopback-testing"
+  },
   "license": {
     "name": "Dual MIT/StrongLoop",
     "url": "https://github.com/strongloop/loopback-testing/blob/master/LICENSE"