Support the `[project]` section (PEP 621) #351

Job	Run time
pre-commit	38s
test (3.7, 1.2.2)	1m 50s
test (3.7, 1.3.2)	1m 10s
test (3.7, 1.4.2)	46s
test (3.7, 1.5.1)	49s
test (3.8, 1.2.2)	1m 40s
test (3.8, 1.3.2)	1m 2s
test (3.8, 1.4.2)	50s
test (3.8, 1.5.1)	42s
test (3.8, 1.6.1)	42s
test (3.8, 1.7.1)	41s
test (3.8, 1.8.1)	44s
test (3.9, 1.2.2)	1m 33s
test (3.9, 1.3.2)	1m 10s
test (3.9, 1.4.2)	51s
test (3.9, 1.5.1)	45s
test (3.9, 1.6.1)	42s
test (3.9, 1.7.1)	46s
test (3.9, 1.8.1)	42s
test (3.10, 1.2.2)	1m 36s
test (3.10, 1.3.2)	1m 9s
test (3.10, 1.4.2)	52s
test (3.10, 1.5.1)	49s
test (3.10, 1.6.1)	44s
test (3.10, 1.7.1)	40s
test (3.10, 1.8.1)	47s
test (3.11, 1.2.2)	1m 28s
test (3.11, 1.3.2)	1m 4s
test (3.11, 1.4.2)	44s
test (3.11, 1.5.1)	40s
test (3.11, 1.6.1)	43s
test (3.11, 1.7.1)	39s
test (3.11, 1.8.1)	39s
test (3.11, git+https://github.com/radoering/poetry.git@pep621-support)	56s
	31m 33s

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