add dummy requirements to test dep installation from sources: https://docs.travis-ci.com/user/installing-dependencies/#Installing-Projects-from-Source
add dummy requirements to test dep installation from sources: https://docs.travis-ci.com/user/installing-dependencies/#Installing-Projects-from-Source

juanmirocks/LocText,Rostlab/LocText,juanmirocks/LocText,juanmirocks/LocText,Rostlab/LocText,Rostlab/LocText