Fixed README typos
Fixed README typos

kerou/SimulatorRemoteNotifications,JinlianWang/SimulatorRemoteNotifications,shekhargupta/SimulatorRemoteNotifications,sexyflash/SimulatorRemoteNotifications,vuchau/SimulatorRemoteNotifications,Nuzzel/SimulatorRemoteNotifications,kirualex/SimulatorRemoteNotifications,acoomans/SimulatorRemoteNotifications