* dev:
  bump version and changlog
  update documentation
  Add unit tests for the Sink impl of pharos
  Update to futures 0.3.0-alpha.19
  Allow comparing ErrorKind to &ErrorKind
  Document the behavior of the futures channels
  Finish flush algorithm now ICE is solved
  fix clippy warning
  fix visibility of Error::kind()
  Update some comments
  ICE in rustc
  Another breaking change to the API.
  Actually, we don't need pin_project