[invites] Add jsInitialised method to improve getInitialInvitation

lib/modules/invites/index.js

@@ -2,6 +2,7 @@
  * @flow
  * Invites representation wrapper
  */
+import { Platform } from 'react-native';
 import { SharedEventEmitter } from '../../utils/events';
 import { getLogger } from '../../utils/log';
 import ModuleBase from '../../utils/ModuleBase';
@@ -37,6 +38,11 @@ export default class Invites extends ModuleBase {
         SharedEventEmitter.emit('onInvitation', invitation);
       }
     );
+
+    // Tell the native module that we're ready to receive events
+    if (Platform.OS === 'ios') {
+      getNativeModule(this).jsInitialised();
+    }
   }
 
   /**