Tests

ci: test with `1`, `lts` and `pre` versions of julia #28

Job	Run time
Tests (1, macos-latest) / Tests	4m 9s
Tests (1, ubuntu-latest) / Tests	3m 56s
Tests (1, windows-latest) / Tests	4m 45s
Tests (lts, macos-latest) / Tests	3m 6s
Tests (lts, ubuntu-latest) / Tests	49s
Tests (lts, windows-latest) / Tests	3m 52s
Tests (pre, macos-latest) / Tests	1m 18s
Tests (pre, ubuntu-latest) / Tests	4m 8s
Tests (pre, windows-latest) / Tests	2m 44s
	28m 47s

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