Version 2.0.0

This major release greatly cleans up the output of pytest-workflow in case of
an error as well as providing the stderr and stdout last bytes for debugging
purposes. When the exit code test fails all other tests from the workflow
are skipped.

• Python 3.6 is no longer supported. It has been removed from github actions,
  as such we can no longer guarantee that pytest-workflow works properly
  with python 3.6.
• Fix an issue where symlinks in git repositories could not be properly copied.
• Added an optional encoding key for files, stdout and stderr so the file can
  be opened with the proper encoding.
• Make content tests more efficient by reading each file only once instead of
  twice when there are both strings and regexes to check for.
• When the --git-aware flag is used a submodule check is performed in order
  to assert that all submodules are properly checked out. This prevents
  unclear copying errors.
• Tests are now skipped if the workflow does not exit with the desired exit
  code, except for the exit code tests, to reduce visual clutter when reporting
  failing tests.
• Tests for checking file content are now skipped when the file does not exist
  in order to reduce visual clutter when reporting failing tests.
• Test and support for Python 3.11.
• Add --stderr-bytes or --sb option to change the maximum
  number of bytes to display for the stderr and stdout on
  command failure.
• Add stderr and stdout to be displayed on command failure
• Document using pytest.ini as a way of setting specific per repository
  settings for pytest-workflow.
• Add tests for nextflow.
• Document the use of environment variables with pytest-workflow.
• A minimum of pytest 7.0.0 is now a requirement for pytest-workflow.
  This fixes the deprecation warnings that started on the release of pytest
  7.0.0.
• Throw a more descriptive error when a file copied with the --git-aware flag
  is not present on the filesystem anymore.
• Document pytest flags -k and -m are not supported.