v0.1.1 of window_to_front

Brings your Flutter desktop application window back to the front of the window stack on Windows, Linux and macOS. Changelog excerpt: - Fixed macOS Swift Package Manager resolution on current Flutter by depending on Flutter's generated FlutterFrameworkpackage instead of FlutterMacOS. - Raised the macOS deployment target to 10.15 (required by FlutterFramework) in both Package.swiftand the podspec.