use the commit hash instead of HEAD for fetching the .travis.yml file
use the commit hash instead of HEAD for fetching the .travis.yml file
openeducation/travis-ci,flores/travis-ci,openeducation/travis-ci,fxposter/travis-ci,openeducation/travis-ci,flores/travis-ci,fxposter/travis-ci,flores/travis-ci,fxposter/travis-ci