Use latest Galaxy release for testing
Use latest Galaxy release for testing

Remove deprecated `sudo: false`, see

https://blog.travis-ci.com/2018-11-19-required-linux-infrastructure-migration

TGAC/earlham-galaxytools,anilthanki/tgac-galaxytools,TGAC/tgac-galaxytools,TGAC/earlham-galaxytools,anilthanki/tgac-galaxytools,TGAC/earlham-galaxytools,anilthanki/tgac-galaxytools,anilthanki/tgac-galaxytools,anilthanki/tgac-galaxytools,TGAC/earlham-galaxytools,TGAC/earlham-galaxytools,TGAC/tgac-galaxytools