upgrade version to 4

Author: massodasuki

molpayxdk/src/main/java/com/molpay/molpayxdk/MOLPayActivity.java

@@ -95,7 +95,7 @@ public class MOLPayActivity extends AppCompatActivity {
     private final static String mppinstructioncapture = "mppinstructioncapture://";
     private final static String module_id = "module_id";
     private final static String wrapper_version = "wrapper_version";
-    private final static String wrapperVersion = "3";
+    private final static String wrapperVersion = "4";
 
     private String base64Img;
     private String filename;