.travis.yml in quicktravel_client-3.6.1 vs .travis.yml in quicktravel_client-3.7.0

@@ -1,8 +1,10 @@
 language: ruby
 rvm:
-  - 2.2.5
-  - 2.3.1
+  - 2.2
+  - 2.3
+  - 2.4
+  - 2.5
 script: bundle && bundle exec rake spec
 gemfile:
   - gemfiles/rails4.gemfile
   - gemfiles/rails5.gemfile
 notifications: