PathNotFoundException in windows platform

[sharpsaravanan]

Thank you for developing this fantastic plugin!

unable to save file in windows platform when filepath parameter is given.
(due to path separator is hard coded in -- ( FileSaver.saveFileOnly (package:file_saver/file_saver.dart:113:15)
return (await file.copy('$applicationDirectory/$name$ext')).path;)

FileSaver.instance.saveFile function return file as 'C:\Users\username\Downloads/image1.png' instead of this 'C:\Users\username\Downloads\image1.png'