Tests

Automatic ITensorFormatter run (#12) #68

Job	Run time
Tests (lts, macOS-latest) / Julia lts - macOS-latest	1m 35s
Tests (1, macOS-latest) / Julia 1 - macOS-latest	1m 34s
Tests (1, ubuntu-latest) / Julia 1 - ubuntu-latest	2m 11s
Tests (lts, ubuntu-latest) / Julia lts - ubuntu-latest	1m 55s
Tests (1, windows-latest) / Julia 1 - windows-latest	3m 4s
Tests (lts, windows-latest) / Julia lts - windows-latest	2m 37s
	12m 56s

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