.travis.yml in swift_client-0.1.5 vs .travis.yml in swift_client-0.1.6

@@ -1,10 +1,9 @@
 
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1.7
-  - 2.2.3
+  - 2.1.10
+  - 2.2.5
+  - 2.3.1
 
 install:
   - "travis_retry bundle install"
 
 script: "bundle exec rake test"