MAINT: recommend `black` extension for vscode #233

Job	Run time
pytest / Determine job matrix	7s
style / Determine skipped pre-commit hooks	10s
pytest / Run unit tests (3.10, ubuntu-22.04)	24s
pytest / Run unit tests (3.11, ubuntu-22.04)	20s
pytest / Run unit tests (3.7, ubuntu-22.04)	23s
pytest / Run unit tests (3.9, ubuntu-22.04)	18s
pytest / Run unit tests (3.6, ubuntu-20.04)	29s
pytest / Run unit tests (3.8, ubuntu-22.04, repoma)	23s
pytest / Run unit tests (3.9, macos-12)	38s
style / Run taplo through pre-commit	24s
style / Run local pre-commit hooks	35s
style / Push changes	0s
	4m 11s

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