ci: allow unchanged coverage #101

Job	Run time
Installation (3.7)	2m 15s
Linting	17s
Pytest (3.7)	1m 31s
Installation (3.8)	3m 26s
Pytest (3.8)	1m 57s
Installation (3.9)	4m 40s
Pytest (3.9)	1m 50s
Installation (3.10)	1m 36s
Pytest (3.10)	1m 55s
Installation (3.11)	1m 33s
Pytest (3.11)	1m 59s
Coverage / Check Pull Request Coverage	0s
Coverage / Update Base Coverage	10s
	23m 9s

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