tidy up dependency features (#106) #9

Job	Run time
Check Style	12s
Test with Miri	40s
features	1m 26s
Test stable on ubuntu-latest	28s
Check MSRV (1.63)	4m 48s
Test stable on windows-latest	56s
Test stable on macOS-latest	1m 15s
Test beta on ubuntu-latest	21s
Test beta on windows-latest	1m 3s
Test beta on macOS-latest	1m 3s
Test nightly on ubuntu-latest	23s
Test nightly on windows-latest	44s
Test nightly on macOS-latest	1m 15s
Build docs	21s
CI is green	1s
	14m 56s

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