Updated deprecation message to new Android SDK documentation

Author: Peter-John-paystack

paystack/src/main/java/co/paystack/android/Constants.kt

@@ -1,4 +1,4 @@
 package co.paystack.android
 
 const val DEPRECATION_MESSAGE =
-    "This SDK has been deprecated, Please refer to our new SDK: https://github.com/PaystackHQ/paystack-sdk-android"
+    "This SDK has been deprecated, Please refer to our new SDK: https://paystack.com/docs/developer-tools/android-sdk/"