v0.1.1

Fixed

• Unit-return classification exempts behaviour callbacks. A function that is a
  callback of one of its module's declared behaviours (direct @behaviour or
  use-injected, read through the behaviour's behaviour_info/1 when it is
  loadable), or whose first clause carries an @impl other than @impl false, is
  never classified unit-returning, however its body reads. Its caller is the
  behaviour's runtime, which the source never shows and which may treat a lone
  :ok as one contract outcome among several — Oban.Worker.perform/1's :ok
  is one of six. 0.1.0 silenced the :ok return mutants of every such callback,
  including mutare_oban's worker-return family.