Update .travis.yml to run XCode8 (#1872)
Update .travis.yml to run XCode8 (#1872)


adozenlines/JSQMessagesViewController,adozenlines/JSQMessagesViewController,jessesquires/JSQMessagesViewController,TeletronicsDotAe/JSQMessagesViewController,derekjcarter/JSQMessagesViewController,derekjcarter/JSQMessagesViewController,sebastianludwig/JSQMessagesViewController,jessesquires/JSQMessagesViewController,TeletronicsDotAe/JSQMessagesViewController,sebastianludwig/JSQMessagesViewController,sebastianludwig/JSQMessagesViewController,derekjcarter/JSQMessagesViewController,TeletronicsDotAe/JSQMessagesViewController,adozenlines/JSQMessagesViewController