fix(metadata): add bugs and showcase url

Author: nivekcode

package.json

@@ -83,5 +83,9 @@
   "repository": {
     "type": "git",
     "url": "https://github.com/kreuzerk/ng-sortgrid.git"
-  }
+  },
+  "bugs": {
+    "url": "https://github.com/kreuzerk/ng-sortgrid/issues"
+  },
+  "homepage": "https://github.com/kreuzerk/ng-sortgrid#readme"
 }