Update rust edition (#7) #43

Job	Run time
Lints	17s
Test Suite (ubuntu-latest, stable)	18s
Test Suite (ubuntu-latest, beta)	18s
Check (ubuntu-latest, stable)	18s
Test Suite (ubuntu-latest, nightly)	20s
Check (ubuntu-latest, beta)	2m 22s
Test Suite (macos-latest, stable)	33s
Check (ubuntu-latest, nightly)	15s
Test Suite (macos-latest, beta)	1m 6s
Check (macos-latest, stable)	26s
Test Suite (macos-latest, nightly)	30s
Check (macos-latest, beta)	23s
Test Suite (windows-latest, stable)	43s
Check (macos-latest, nightly)	28s
Test Suite (windows-latest, beta)	35s
Check (windows-latest, stable)	35s
Test Suite (windows-latest, nightly)	37s
Check (windows-latest, beta)	31s
Check (windows-latest, nightly)	30s
	11m 5s

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