2.1.0

• Add support for new dart:io API methods added in Dart SDK 1.23

2.0.1

• Minor doc updates

2.0.0

• Improved toString implementations in file system entity classes
• Added ForwardingFileSystem and associated forwarding classes to the
  main file library
• Removed FileSystem.pathSeparator, and added a more comprehensive
  FileSystem.path property
• Added FileSystemEntity.basename and FileSystemEntity.dirname
• Added the record_replay library
• Added the testing library