iOS: "Module RNUportHDSigner requires main queue setup"

[simonas-notcat]

New RN app using "react-native": "0.59.5".

Getting this warning:

Module RNUportHDSigner requires main queue setup since it overrides `constantsToExport` but doesn't implement `requiresMainQueueSetup`. In a future release React Native will default to initializing all native modules on a background thread unless explicitly opted-out of.

[simonas-notcat]

@aldigjo you probably only need to add:

+ (BOOL)requiresMainQueueSetup
{
    return NO;
}

[mirceanis]

fixed in #12