AVFoundation watchOS 5.0 Beta 2 to Beta 3 API Differences

../Frameworks/AVFAudio.framework/Headers/AVAudioSession.h
Modified -[AVAudioSession activateWithOptions:completionHandler:]
Declaration
From- (void)activateWithOptions:(AVAudioSessionActivationOptions)options completionHandler:(nonnull void (^)(NSError * _Nonnull))handler
To- (void)activateWithOptions:(AVAudioSessionActivationOptions)options completionHandler:(nonnull void (^)(NSError * _Nullable))handler