Syntax errors fixed. Merge pull request #23 from Countly/dev-junaid

Author: ArtursKadikis

Countly.js

@@ -242,7 +242,7 @@ Countly.disableLocation = function(){
  * Get currently used device Id.
  * Should be call after Countly init
  * */
-  static Future<String> getCurrentDeviceId() async {
+Countly.getCurrentDeviceId = async function(){
     if(!await Countly.isInitialized()) {
         console.warn('getCurrentDeviceId, init must be called before getCurrentDeviceId');
         return "init must be called before getCurrentDeviceId";

android/src/main/java/ly/count/android/sdk/react/CountlyReactNative.java

@@ -177,9 +177,9 @@ public void getDeviceIdAuthor(ReadableArray args, final Callback myCallback){
         else {
             Log.d(Countly.TAG, "[CountlyReactNative] getDeviceIdAuthor: " + deviceIDType);
             if(deviceIDType == DeviceId.Type.DEVELOPER_SUPPLIED){
-                myCallback.success("developerProvided");
+                myCallback.invoke("developerProvided");
             }else{
-                myCallback.success("sdkGenerated");
+                myCallback.invoke("sdkGenerated");
             }
         }
     }