Version bump to 2.1.2

Author: jkasten2

OneSignalSDK/onesignal/src/main/java/com/onesignal/OneSignal.java

@@ -155,7 +155,7 @@ public void init() {
    private static TrackGooglePurchase trackGooglePurchase;
    private static TrackAmazonPurchase trackAmazonPurchase;
 
-   public static final String VERSION = "020101";
+   public static final String VERSION = "020102";
 
    private static AdvertisingIdentifierProvider mainAdIdProvider = new AdvertisingIdProviderGPS();