Improve README #73

Job	Run time
check-typing / mypy	2m 13s
check-package / init-store	5s
check-precommit / pre-commit	16s
check-docs / make-docs (html)	1m 36s
check-schema / schema	12s
check-docs / make-docs (doctest)	1m 48s
check-docs / make-docs (linkcheck)	1m 35s
check-package / pkg-build (ubuntu-latest)	22s
check-package / pkg-check (ubuntu-latest, 3.8)	1m 31s
check-package / pkg-check (ubuntu-latest, 3.10)	1m 29s
check-package / pkg-check (macos-latest, 3.8)	1m 23s
check-package / pkg-check (macos-latest, 3.10)	1m 21s
check-package / pkg-check (windows-latest, 3.8)	1m 25s
check-package / pkg-check (windows-latest, 3.10)	1m 25s
check-package / pkg-guardian	1m 15s
	17m 56s

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