- update to 0.9.0:
  * removed legacy implementation of `HierarchicalMachine` from
    the package
  * Bug #551: Fix active state styling in `GraphMachine` (thanks
    @betaboon)
  * Bug #554: Fix issues related to scopes and queueing in
    `HierachicalMachine` (thanks @jankrejci)
  * Bug #568: Reflexive transitions (dest: '=') had not been
    resolved correctly when source was a wildcard (thanks @jnu)
  * Bug #568: HSM did not detect reflexive transitions if src was
    a parent state (thanks @lostcontrol)
  * Bug #569: Fix implicit fallback to `graphviz` when
    `pygraphviz` was not installed (thanks @FridjofAmundsen)
  * Bug #580: Fix `on_timeout` callback resolution when timeout
    had been initialized with `timeout=0` (thanks @Rysbai)
  * Bug #582: Last label in `GraphSupport` was not correctly
    aligned when `show_attributes=True` (thanks @spagh-eddie)
  * Feature: Add pyi stub files for better type hinting. Since
    many functions and constructors allow rather arbitrary
    arguments time will tell whether typing should be strict (and
    cause more mypy issues) or more relaxed (and thus less
    precise).
  * Feature: Reviewed and improved method documentation
  * Feature #549: Add `may` transition check to transitions
    (thanks @artofhuman)
  * Feature #552: Refactored error handling to be able to handle
    `MachineError` in `on_exception` callbacks (thanks @kpihus)
  * Feature: Add `mypy` to test workflow
  * PR #461: Add `Retry` state to supported state stereotypes
    (thanks @rgov)

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- remove pep8 unit tests, those are not useful to execute and
  fail

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