README: Specify Xcode version.

Fix #21792
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Paul Rouget 2019-04-01 13:32:17 +02:00 committed by GitHub
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@ -51,6 +51,9 @@ Please select your operating system:
* [Android](#cross-compilation-for-android)
#### macOS
Xcode version 10.2 or above is recommended.
##### On macOS (homebrew)
``` sh