.travis.yml in github-ds-0.2.11 vs .travis.yml in github-ds-0.3.0

@@ -11,5 +11,7 @@
   - RAILS_VERSION=6.0.0.rc1
   - RAILS_VERSION=5.2.0
   - RAILS_VERSION=5.1.5
   - RAILS_VERSION=5.0.6
   - RAILS_VERSION=4.2.10
+services:
+  - mysql