.travis.yml in airborne-0.1.20 vs .travis.yml in airborne-0.2.0

@@ -1,10 +1,11 @@
 sudo: false
 language: ruby
 rvm:
   - 2.0.0
   - 2.1.0
-  - 2.1.3
+  - 2.1.7
+  - 2.2.3
 
 
 script: bundle exec rspec spec
 before_install:
   - gem update --system