fix typo in README about the compileSdkVersion

Author: assanbayg

permission_handler/README.md

@@ -33,7 +33,7 @@ android.useAndroidX=true
 android.enableJetifier=true
 ```
 
-2. Make sure you set the `compileSdkVersion` in your "android/app/build.gradle" file to 33:
+2. Make sure you set the `compileSdkVersion` in your "android/app/build.gradle" file to 35:
 
 ```gradle
 android {