switch from docopt to docopt-ng #40

Job	Run time
coverage	1m 6s
setup (ubuntu-latest)	26s
pytest (3.8, py38, ubuntu-latest)	1m 11s
setup (windows-latest)	1m 37s
test_pre_commit	21s
pytest (3.8, py38, windows-latest)	3m 29s
setup (macos-latest)	24s
pytest (3.8, py38, macos-latest)	1m 49s
pytest (3.9, py39, ubuntu-latest)	1m 17s
pytest (3.9, py39, windows-latest)	2m 44s
pytest (3.9, py39, macos-latest)	1m 25s
pytest (3.10, py310, ubuntu-latest)	1m 4s
pytest (3.10, py310, windows-latest)	2m 47s
pytest (3.10, py310, macos-latest)	1m 8s
pytest (3.11, py311, ubuntu-latest)	1m 0s
pytest (3.11, py311, windows-latest)	3m 4s
pytest (3.11, py311, macos-latest)	1m 14s
pytest (ubuntu-latest, 3.8, tensorflow-27)	1m 24s
pytest (ubuntu-latest, 3.9, tensorflow-28)	1m 24s
pytest (ubuntu-latest, 3.10, tensorflow-29)	1m 8s
pytest (ubuntu-latest, 3.10, tensorflow-210)	1m 11s
pytest (ubuntu-latest, 3.10, tensorflow-211)	1m 5s
pytest (ubuntu-latest, 3.9, numpy-120)	44s
pytest (ubuntu-latest, 3.10, numpy-121)	47s
pytest (ubuntu-latest, 3.10, numpy-123)	50s
pytest (ubuntu-latest, 3.11, numpy-124)	46s
	35m 25s

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