v0.9.11

Added

• Native checksums on the asyncssh SFTP backend. SftpPath.checksum()
  and supported_checksums() now send the check-file-handle extension on
  AsyncsshSftpBackend (the backend chosen when asyncssh is installed), as
  they already did on the paramiko backend. Against a server that implements
  it (ProFTPD's mod_sftp, for example), PathSyncer compares server-side
  digests instead of reading both files. OpenSSH does not implement it: the
  refusal costs one request per connection, and files are compared by
  streaming as before. A native checksum() is not bounded by the backend's
  timeout, because the server hashes the whole file before it answers.

Changed

• The uri extra now requires netimps>=0.3.1 (was >=0.2.0). An
  environment that pins an older netimps must raise that pin.

Full Changelog: v0.9.10...v0.9.11