.travis.yml in bot_twitter_ebooks-3.3.1 vs .travis.yml in bot_twitter_ebooks-3.3.2

@@ -1,6 +1,6 @@
 rvm:
-  - 2.4.2
+  - 2.5.0
 script:
   - rspec spec
 notifications:
   email:
     - [e-mail]