Removed useless logging statement

Author: auser

lib/firestackModule.js

@@ -86,7 +86,6 @@ export class FirestackModule {
     const toObject = this._toObject;
 
     const _itemAdded = (snapshot, prevKey) => {
-console.log('_itemAdded called', snapshot);
       const state = this._getState(); // local state
       const newItem = toObject(snapshot, state);
       let list = state.items || [];