tests

Improve readme #467

Job	Run time
Tests (8.1, ubuntu-latest, prefer-lowest)	15s
Tests (8.1, ubuntu-latest, prefer-stable)	49s
Tests (8.1, macos-latest, prefer-lowest)	1m 33s
Tests (8.1, macos-latest, prefer-stable)	1m 20s
Tests (8.1, windows-latest, prefer-lowest)	40s
Tests (8.1, windows-latest, prefer-stable)	41s
Tests (8.2, ubuntu-latest, prefer-lowest)	18s
Tests (8.2, ubuntu-latest, prefer-stable)	16s
Tests (8.2, macos-latest, prefer-lowest)	1m 41s
Tests (8.2, macos-latest, prefer-stable)	1m 31s
Tests (8.2, windows-latest, prefer-lowest)	40s
Tests (8.2, windows-latest, prefer-stable)	44s
Tests (8.3, ubuntu-latest, prefer-lowest)	20s
Tests (8.3, ubuntu-latest, prefer-stable)	14s
Tests (8.3, macos-latest, prefer-lowest)	1m 11s
Tests (8.3, macos-latest, prefer-stable)	2m 3s
Tests (8.3, windows-latest, prefer-lowest)	45s
Tests (8.3, windows-latest, prefer-stable)	35s
Tests (8.4, ubuntu-latest, prefer-lowest)	13s
Tests (8.4, ubuntu-latest, prefer-stable)	31s
Tests (8.4, macos-latest, prefer-lowest)	1m 57s
Tests (8.4, macos-latest, prefer-stable)	1m 19s
Tests (8.4, windows-latest, prefer-lowest)	45s
Tests (8.4, windows-latest, prefer-stable)	36s
	20m 57s

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