Update Travis versions of Node and NPM.
Update Travis versions of Node and NPM.

nztqa/wekan,nztqa/wekan,wekan/wekan,johnleeming/wekan,johnleeming/wekan,wekan/wekan,GhassenRjab/wekan,wekan/wekan,wekan/wekan,GhassenRjab/wekan,libreboard/libreboard,johnleeming/wekan,nztqa/wekan,johnleeming/wekan,libreboard/libreboard,wekan/wekan,GhassenRjab/wekan