v0.13.0

Usability improvements:

• Use the same random module name during a notebook session to allow --ff and
  similar options to work correctly
• Allow to specify defopts="auto". It only adds the current notebook to the
  PyTest arguments, if no other node id that referencing the notebook is
  specified. This way specifying node ids manually should work as expected
  without any configuration change in most cases
• Add shorthands to generate node ids for tests using {test_example} as an
  argument will expand to {MODULE}::test_example
• Allow to override addopts, defopts, run_in_thread, raise_on_error,
  display_columns in ipytest.run
• Allow to specify all keyword arguments of ipytest.run also in %%ipytest by
  including an initial comment of the form # ipytest: arg1=value1, arg2=value
• Rename clean_tests to clean and deprecate clean_tests. The optional
  scope argument now expects a module instead of a dictionary
• Add ipytest.force_reload, as a simpler to use alternative to the current
  reload function

Bug fixes:

• Fix bug for --deselect {MODULE}::test
• Disable variable expansion in magics to prevent issues with the {node_id}
  shorthands in notebooks

Development changes:

• Use markdown for module documentation and doc strings
• Migrated to pyproject.toml
• Updated documentation