Build for netstandard2.0 #46

Job	Run time
Build (ubuntu-latest, release)	22s
Build (macos-latest, release)	18s
Build (windows-latest, release)	43s
Build (windows-latest, debug)	48s
Build (ubuntu-latest, debug)	27s
Build (macos-latest, debug)	22s
	3m 0s

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