Run mypy as a pre-commit hook #110

Job	Run time
lint	52s
Python 3.8 / Django 3.2	27s
Python 3.8 / Django 4.2	32s
Python 3.9 / Django 3.2	36s
Python 3.9 / Django 4.2	32s
Python 3.10 / Django 3.2	30s
Python 3.10 / Django 4.2	30s
Python 3.10 / Django 5.0	29s
Python 3.11 / Django 3.2	27s
Python 3.11 / Django 4.2	26s
Python 3.11 / Django 5.0	28s
Python 3.12 / Django 3.2	30s
Python 3.12 / Django 4.2	33s
Python 3.12 / Django 5.0	40s
Python pypy-3.10 / Django 3.2	53s
Python pypy-3.10 / Django 4.2	53s
Python pypy-3.10 / Django 5.0	1m 4s
Python 3.12 / Django packaging	34s
Python 3.12 / Django main	15s
Indicate completion to coveralls.io	3s
	11m 14s

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