tests

Improve readme #473

Job	Run time
Tests (8.1, ubuntu-latest, prefer-lowest)	14s
Tests (8.1, ubuntu-latest, prefer-stable)	14s
Tests (8.1, macos-latest, prefer-lowest)	1m 52s
Tests (8.1, macos-latest, prefer-stable)	1m 28s
Tests (8.1, windows-latest, prefer-lowest)	34s
Tests (8.1, windows-latest, prefer-stable)	42s
Tests (8.2, ubuntu-latest, prefer-lowest)	18s
Tests (8.2, ubuntu-latest, prefer-stable)	19s
Tests (8.2, macos-latest, prefer-lowest)	1m 40s
Tests (8.2, macos-latest, prefer-stable)	1m 39s
Tests (8.2, windows-latest, prefer-lowest)	39s
Tests (8.2, windows-latest, prefer-stable)	38s
Tests (8.3, ubuntu-latest, prefer-lowest)	18s
Tests (8.3, ubuntu-latest, prefer-stable)	21s
Tests (8.3, macos-latest, prefer-lowest)	1m 32s
Tests (8.3, macos-latest, prefer-stable)	1m 50s
Tests (8.3, windows-latest, prefer-lowest)	35s
Tests (8.3, windows-latest, prefer-stable)	44s
Tests (8.4, ubuntu-latest, prefer-lowest)	12s
Tests (8.4, ubuntu-latest, prefer-stable)	12s
Tests (8.4, macos-latest, prefer-lowest)	1m 48s
Tests (8.4, macos-latest, prefer-stable)	2m 7s
Tests (8.4, windows-latest, prefer-lowest)	30s
Tests (8.4, windows-latest, prefer-stable)	42s
	21m 8s

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