iOS 14b7 crash on launch

[antiraum]

When running on iOS 14 beta7 my app crashes on launch with the following exception:

-[MBBKnuff advertiser:didNotStartAdvertisingPeer:]: unrecognized selector sent to instance 0x2818c6560
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MBBKnuff advertiser:didNotStartAdvertisingPeer:]: unrecognized selector sent to instance 0x2818c6560'

[carlullman]

The problem is that Knuff.m files is missing the optional delegate method for MCNearbyServiceAdvertiserDelegate

-(void) advertiser:(MCNearbyServiceAdvertiser *)advertiser didNotStartAdvertisingPeer:(NSError *)error
{
}