Update gherkin dependency to version 2.4.0
Update gherkin dependency to version 2.4.0

openeducation/travis-ci,fxposter/travis-ci,fxposter/travis-ci,openeducation/travis-ci,openeducation/travis-ci,fxposter/travis-ci,flores/travis-ci,flores/travis-ci,flores/travis-ci