Added IAM stubbing and added return promise for iOS

Author: rgomezp

index.js

@@ -465,6 +465,7 @@ export default class OneSignal {
         } else {
             console.log("This function is not yet implemented on iOS");
         }
+        return Promise.resolve(null);
     }
 
     static pauseInAppMessages(pause) {
@@ -477,4 +478,4 @@ export default class OneSignal {
         }
     }
 
-}
+}

ios/RCTOneSignal/RCTOneSignalEventEmitter.m

@@ -355,4 +355,7 @@ + (void)sendEventWithName:(NSString *)name withBody:(NSDictionary *)body {
     //unimplemented in iOS
 }
 
+RCT_EXPORT_METHOD(initInAppMessageClickHandlerParams) {
+    //unimplemented in iOS
+}
 @end