Start testing ruby 2.6

cben · cben · commit eaeaa7f6bef2 · 2018-05-23T14:04:00.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,6 +4,7 @@ rvm:
   - "2.3.0"
   - "2.4.0"
   - "2.5.0"
+  - "2.6.0-preview1"
 sudo: false
 cache: bundler
 script: bundle exec rake $TASK
