Update README

README.md

@@ -26,11 +26,11 @@ dependencies {
  implementation 'com.android.support:design:27.1.1'
  implementation 'com.google.code.gson:gson:2.8.5'
  implementation 'com.android.volley:volley:1.1.0'
- implementation 'com.github.checkout:frames-android:v2.1.2'
+ implementation 'com.github.checkout:frames-android:v2.1.3'
 }
 ```
 
-> You can find more about the installation [here](https://jitpack.io/#checkout/frames-android/v2.1.2)
+> You can find more about the installation [here](https://jitpack.io/#checkout/frames-android/v2.1.3)
 
 > Please keep in mind that the Jitpack repository should to be added to the project gradle file while the dependency should be added in the module gradle file. [(see more about gradle files)](https://developer.android.com/studio/build)
 
@@ -86,7 +86,7 @@ dependencies {
     // initialise the payment from
     mPaymentForm = findViewById(R.id.checkout_card_form);
     mPaymentForm
-        .setSubmitListener(mSubmitListener)    // set the callback
+        .setFormListener(mFormListener)        // set the callback
         .setEnvironment(Environment.SANDBOX)   // set the environemnt
         .setKey("pk_xxx");                     // set your public key
 ```