Update open4 dependency to version 1.1.0
Update open4 dependency to version 1.1.0

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