README: added note about watchOS and tvOS support
README: added note about watchOS and tvOS support
kevin-zqw/ReactiveCocoa,tzongw/ReactiveCocoa,ohwutup/ReactiveCocoa,victorlin/ReactiveCocoa,smilypeda/ReactiveCocoa,andersio/ReactiveCocoa,tzongw/ReactiveCocoa,smilypeda/ReactiveCocoa,ohwutup/ReactiveCocoa,sandyway/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,calebd/ReactiveCocoa,victorlin/ReactiveCocoa,ohwutup/ReactiveCocoa,tonyarnold/ReactiveCocoa,kevin-zqw/ReactiveCocoa,calebd/ReactiveCocoa,andersio/ReactiveCocoa,Juraldinio/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,Juraldinio/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,ikesyo/ReactiveCocoa,rpowelll/ReactiveCocoa,rpowelll/ReactiveCocoa,tzongw/ReactiveCocoa,walkingsmarts/ReactiveCocoa,tonyarnold/ReactiveCocoa,sandyway/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,victorlin/ReactiveCocoa,rpowelll/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,walkingsmarts/ReactiveCocoa,tonyarnold/ReactiveCocoa,smilypeda/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,kevin-zqw/ReactiveCocoa,walkingsmarts/ReactiveCocoa,Juraldinio/ReactiveCocoa,sandyway/ReactiveCocoa,andersio/ReactiveCocoa,calebd/ReactiveCocoa,ikesyo/ReactiveCocoa