Flake8

Fix installation and usage instructions in README.md #24

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Job	Run time
build (ubuntu-latest, 3.8)	16s
build (ubuntu-latest, 3.9)	10s
build (ubuntu-latest, 3.10)	10s
build (ubuntu-latest, 3.11)	13s
build (ubuntu-latest, 3.12)	12s
build (ubuntu-latest, 3.13)	11s
build (windows-latest, 3.8)	41s
build (windows-latest, 3.9)	42s
build (windows-latest, 3.10)	35s
build (windows-latest, 3.11)	39s
build (windows-latest, 3.12)	33s
build (windows-latest, 3.13)	48s
build (macos-latest, 3.8)	50s
build (macos-latest, 3.9)	26s
build (macos-latest, 3.10)	26s
build (macos-latest, 3.11)	11s
build (macos-latest, 3.12)	12s
build (macos-latest, 3.13)	11s
	7m 26s