.travis.yml in g5_authentication_client-0.5.4 vs .travis.yml in g5_authentication_client-0.5.5

@@ -1,7 +1,6 @@
 language: ruby
 rvm:
-  - 2.0.0
-  - 2.1.6
-  - 2.2.2
+  - 2.2.6
+  - 2.3.3
 script:
   - bundle exec rspec spec