Updated readme with async usage.
Updated readme with async usage.

AtmosphereMessaging/Cumulus,AtmosphereMessaging/Cumulus,sbalkum/Nimbus,heinrichbreedt/Nimbus,stevescc/Nimbus,stevescc/Nimbus,KodrAus/Nimbus,NimbusAPI/Nimbus_v2,rebase42/Anubus,NimbusAPI/Nimbus,NimbusAPI/Nimbus_v2,sbalkum/Nimbus,heinrichbreedt/Nimbus,NimbusAPI/Nimbus_v2,sbalkum/Nimbus,KodrAus/Nimbus,NimbusAPI/Nimbus,stevescc/Nimbus,rebase42/Anubus,rebase42/Anubus,heinrichbreedt/Nimbus,KodrAus/Nimbus,AtmosphereMessaging/Cumulus