Modify .travis.yml for docker
Modify .travis.yml for docker

exercism/xperl6,mienaikage/exercism-perl6,mienaikage/exercism-perl6,exercism/xperl6,mienaikage/exercism-perl6,mienaikage/xperl6,mienaikage/xperl6,exercism/xperl6,mienaikage/xperl6