.travis.yml in elmas-3.0.0 vs .travis.yml in elmas-3.0.1

@@ -1,7 +1,7 @@
 language: ruby
 rvm:
-  - 2.3.1
+  - 2.5.1
 cache: bundler
 notifications:
   webhooks:
     urls:
       - https://webhooks.gitter.im/e/fe18055a45cdf1a5ecae