Update API endpoints

Hi,

Just updating endpoints to reflect the new API.
This fixes the build ([before](https://travis-ci.org/infertux/travis-ruby-client/builds/3302423) & [after](https://travis-ci.org/infertux/travis-ruby-client/builds/3302576)).

However, Faraday seems to be having [some issues](https://travis-ci.org/technoweenie/faraday) with SSL on JRuby, hence the red dot.

Thanks for Travis CI btw, it rocks!