Update README (#236) #843

Job	Run time
Build (x86_64-pc-windows-msvc)	9m 40s
Build (aarch64-pc-windows-msvc)	7m 17s
Build (x86_64-apple-darwin)	6m 14s
Build (aarch64-apple-darwin)	8m 35s
Build (aarch64-apple-ios)	7m 58s
Build (aarch64-apple-ios-sim)	8m 34s
Build (x86_64-unknown-linux-gnu)	3m 55s
Build (aarch64-unknown-linux-gnu)	5m 28s
Build (aarch64-linux-android)	4m 10s
Build (armv7-linux-androideabi)	3m 54s
Build (x86_64-linux-android)	8m 13s
	1h 13m 58s

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