• Fixed retry problem in Producer, when buffer is not reset to 0 offset.
  Thanks to @ngavrysh for the fix in Tubular/aiokafka fork. (issue #184)
• Fixed how Producer handles retries on Leader node failure. It just did not
  work before... Thanks to @blugowski for the help in locating the problem.
  (issue #176, issue #173)
• Fixed degrade in v0.2.2 on Consumer with no group_id. (issue #166)