.travis.yml in beaker-4.6.0 vs .travis.yml in beaker-4.7.0

@@ -4,8 +4,9 @@
 language: ruby
 script: "bundle exec rake travis"
 notifications:
   email: false
 rvm:
+  - 2.6
   - 2.0.0
   - 1.9.3
   - 1.8.7-p374