Update travis to use latest version of CocoaPods
Update travis to use latest version of CocoaPods

legendecas/Rocket.Chat.iOS,haitran2011/Rocket.Chat.iOS,legendecas/Rocket.Chat.iOS,RocketChat/Rocket.Chat.iOS,RocketChat/Rocket.Chat.iOS,RocketChat/Rocket.Chat.iOS,legendecas/Rocket.Chat.iOS,haitran2011/Rocket.Chat.iOS,haitran2011/Rocket.Chat.iOS