Darker doesn't work with github action

[Asuskf]

Configuration:

test_pep8:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0 
      - uses: actions/setup-python@v4
      - uses: akaihola/darker@1.5.1

Error:

TypeError: gen_python_files() got an unexpected keyword argument 'gitignore'

[akaihola]

This has been fixed in Darker 1.6.0.