tests

Improve readme logo #235

Job	Run time
Tests (8.1, ubuntu-latest, prefer-lowest)	1m 19s
Tests (8.1, ubuntu-latest, prefer-stable)	54s
Tests (8.1, macos-latest, prefer-lowest)	2m 10s
Tests (8.1, macos-latest, prefer-stable)	1m 38s
Tests (8.1, windows-latest, prefer-lowest)	1m 31s
Tests (8.1, windows-latest, prefer-stable)	1m 31s
Tests (8.2, ubuntu-latest, prefer-lowest)	1m 10s
Tests (8.2, ubuntu-latest, prefer-stable)	51s
Tests (8.2, macos-latest, prefer-lowest)	2m 11s
Tests (8.2, macos-latest, prefer-stable)	2m 4s
Tests (8.2, windows-latest, prefer-lowest)	1m 35s
Tests (8.2, windows-latest, prefer-stable)	1m 29s
Tests (8.3, ubuntu-latest, prefer-lowest)	1m 9s
Tests (8.3, ubuntu-latest, prefer-stable)	1m 0s
Tests (8.3, macos-latest, prefer-lowest)	1m 43s
Tests (8.3, macos-latest, prefer-stable)	1m 55s
Tests (8.3, windows-latest, prefer-lowest)	1m 35s
Tests (8.3, windows-latest, prefer-stable)	1m 41s
	27m 26s

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