Not compatible with newer versions of dart

[Minigrim0]

It seems the Overflow overflow constructor parameter for Stacks has been removed in newer version, leading to failure when trying to build an app using this library.

https://api.flutter.dev/flutter/widgets/Stack-class.html#constructors

💪 Building with sound null safety 💪

../../../.pub-cache/hosted/pub.dartlang.org/flutter_swipable-1.2.1/lib/flutter_swipable.dart:132:26: Error: No named parameter with the name 'overflow'.
            child: Stack(overflow: Overflow.visible, children: [
                         ^^^^^^^^
/opt/flutter/packages/flutter/lib/src/widgets/basic.dart:3708:3: Context: Found this candidate, but the arguments don't match.
  Stack({
  ^^^^^


FAILURE: Build failed with an exception.