Added a dummy promise that returns true for android API initialization

This makes it match the iOS signature and fulfills what typescript says will be there.

This does not actually handle any errors so that should probably be added at some point in the future.

Author: keeslinp

android/src/main/java/com/iterable/reactnative/RNIterableAPIModule.java

@@ -69,7 +69,7 @@ public String getName() {
     }
 
     @ReactMethod
-    public void initializeWithApiKey(String apiKey, ReadableMap configReadableMap, String version) {
+    public void initializeWithApiKey(String apiKey, ReadableMap configReadableMap, String version, Promise promise) {
         IterableLogger.d(TAG, "initializeWithApiKey: " + apiKey);
         IterableConfig.Builder configBuilder = Serialization.getConfigFromReadableMap(configReadableMap);
 
@@ -91,6 +91,9 @@ public void initializeWithApiKey(String apiKey, ReadableMap configReadableMap, S
 
         IterableApi.initialize(reactContext, apiKey, configBuilder.build());
         IterableApi.getInstance().setDeviceAttribute("reactNativeSDKVersion", version);
+        // TODO: Figure out what the error cases are and handle them appropriately
+        // This is just here to match the TS types and let the JS thread know when we are done initializing
+        promise.resolve(true);
     }
 
     @ReactMethod