README typo fixed
README typo fixed

boboldehampsink/NotificationPusher,grigoritaadrian/NotificationPusher,Doka-NT/NotificationPusher,SoldierCorp/NotificationPusherNoBadge,monove/NotificationPusher,lode/NotificationPusher,unit27/NotificationPusher,Ph3nol/NotificationPusher,angelitodelcielo/NotificationPusher,kirant400/NotificationPusher