Tests

Fix typo in README #1458

Job	Run time
Tests (1, ubuntu-latest) / Julia 1 - ubuntu-latest	42m 40s
Tests (lts, macOS-latest) / Julia lts - macOS-latest	10m 49s
Tests (1, windows-latest) / Julia 1 - windows-latest	1h 0m 41s
Tests (1, macOS-latest) / Julia 1 - macOS-latest	16m 22s
Tests (lts, windows-latest) / Julia lts - windows-latest	1h 34m 57s
Tests (lts, ubuntu-latest) / Julia lts - ubuntu-latest	1h 19m 1s
	5h 4m 30s

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