Add a disclaimer to the README #821

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Run time

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Job	Run time
coverage	18m 19s
build	17m 14s
black	17m 18s
docs	17m 7s
flake8	17m 6s
mypy	17m 8s
mypy-ratchet	17m 18s
parsing	16m 56s
poetry-up-to-date	17m 13s
	2h 35m 39s