.travis.yml in rtanque-0.1.2 vs .travis.yml in rtanque-0.1.3

@@ -3,8 +3,13 @@
 script: bundle exec rspec
 rvm:
   - 1.9.2
   - 1.9.3
   - 2.0.0
+  - 2.1.0
+  - 2.2.0
+  - 2.3.6
+  - 2.4.3
+  - 2.5.0
 branches:
   only:
     - master