fix readme for stripe package

Author: remonh87

packages/stripe/README.md

@@ -59,14 +59,11 @@ This plugin requires several changes to be able to work on Android devices. Plea
 -dontwarn com.stripe.android.pushProvisioning.PushProvisioningActivityStarter$Error
 -dontwarn com.stripe.android.pushProvisioning.PushProvisioningActivityStarter
 -dontwarn com.stripe.android.pushProvisioning.PushProvisioningEphemeralKeyProvider
+# Keep Stripe classes
+-keep class com.stripe.** { *; }
 ```
-8. Add the following line to your `gradle.properties` file: [example](https://github.com/flutter-stripe/flutter_stripe/blob/master/example/android/gradle.properties)
-```properties
-android.enableR8.fullMode=false
-```
-This will prevent crashes with the Stripe SDK on Android (see [issue](https://github.com/flutter-stripe/flutter_stripe/issues/1909)).
 
-9. Rebuild the app, as the above changes don't update with hot reload
+8. Rebuild the app, as the above changes don't update with hot reload
 
 These changes are needed because the Android Stripe SDK requires the use of the AppCompat theme for their UI components and the Support Fragment Manager for the Payment Sheets