Bugfix and small feature release. First release in some time. Fixing lots of bugs and adds a few new features. Below are the highlights. Features: * [GH-301] support rename extension for server * [GH-332] Added a ClientOption to determine whether to use Fstat or Stat * [GH-315] make SFTP extensions configurable Bugfixes: * [GH-291] Wrong S_IFMT mask when converting filemode bits to os.FileMode * [GH-295] sftp resume produces corrupted files * [GH-298] Extensions are not announced by the server * [GH-329] fix S_IFMT value on windows, plan9 and js/wasm * [GH-325] Request.Attributes() panics when called with the Attr slice empty * [GH-309] fix: received packet too long Thanks to all the contributors. Your time and patience is appreciated.