fix typo in .travis.yml
fix typo in .travis.yml

perhaps this will make snapshots start publishing themselves again

references #451

lrytz/scala,martijnhoekstra/scala,scala/scala,lrytz/scala,martijnhoekstra/scala,martijnhoekstra/scala,lrytz/scala,martijnhoekstra/scala,scala/scala,scala/scala,scala/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,lrytz/scala