.travis.yml in omniauth-webex-oauth2-0.0.1 vs .travis.yml in omniauth-webex-oauth2-0.0.2

@@ -1,7 +1,8 @@
 language: ruby
 rvm:
   - 2.2.6
   - 2.3.3
   - 2.4.0
+  - 2.5.1
 before_install:
   - gem install bundler -v 1.16.1
\ No newline at end of file