MacOS/iOS/tvOS build

Readme: fix appveyor badge #1022

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Run time

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Job	Run time
MacOS -> Pre-Checks	12s
MacOS -> MacOS-Release	9m 24s
MacOS -> iOS-Release	3m 10s
MacOS -> MacOS-Debug	5m 55s
MacOS -> iOS-Debug	2m 41s
MacOS -> tvOS-Debug	3m 28s
	24m 50s