Revert "Update .travis.yml to account for Travis changes (especially now that Docker is no longer experimental :tada:)"
Revert "Update .travis.yml to account for Travis changes (especially now that Docker is no longer experimental :tada:)"

This reverts commit 25ad65aeeda2d359bb7aea8f72372fe1d7f27b05.

caoyangs/docs,nats-io/docker-docs,docker-flink/docs,docker-library/docs,avoinea/docs,Lightstreamer/docs,c0b/docs,vaygr/docker-library-docs,Bonitasoft-Community/docker_docs,dpwspoon/docs,Bonitasoft-Community/docker_docs,dinogun/docs,docker-library/docs,appropriate/docker-library-docs,jetty-project/docker-docs,tilosp-docker/library-docs,car031/docs,31z4/docs,docker-solr/docs,astawiarski/docs,31z4/docs,davidcurrie/docs,Lightstreamer/docs,tilosp-docker/library-docs,ceejatec/docs,odoo/docker-docs,jetty-project/docker-docs,gprivitera/docs,dmetzler/docker-library-docs,orientechnologies/docker-docs,vmassol/docs,jperrin/docs,caoyangs/docs,zendtech/docs,pierreozoux/docs,zendtech/docs,emilevauge/docs,odoo/docker-docs,pydio/docs,vmassol/docs,c0b/docs,emilevauge/docs,testshotagit/docs,infosiftr/docker-library-docs,orientechnologies/docker-docs,docker-flink/docs,nats-io/docker-docs,gprivitera/docs,dmetzler/docker-library-docs,vaygr/docker-library-docs,astawiarski/docs,car031/docs,crate/docker-docs,dpwspoon/docs,docker-solr/docs,pierreozoux/docs,dinogun/docs,jperrin/docs,testshotagit/docs,crate/docker-docs,appropriate/docker-library-docs,infosiftr/docker-library-docs,avoinea/docs,ceejatec/docs,davidcurrie/docs,pydio/docs