Update README.md

Author: erdemyerebasmaz

libs/sdk-flutter/README.md

@@ -6,7 +6,7 @@ The [flutter_rust_bridge](https://github.com/fzyzcjy/flutter_rust_bridge) is use
 ## Build
 
 ### Prerequisites:
-* Flutter version `3.19.0`
+* Flutter version `3.32.1`
 * set the ANDROID_NDK_HOME env variable to your sdk home folder
 ```
 export ANDROID_NDK_HOME=<your android ndk directory>