.travis.yml in gecko-ruby-0.2.6 vs .travis.yml in gecko-ruby-0.5.0

@@ -1,9 +1,10 @@
 language: ruby
 before_install:
  - gem install bundler
 rvm:
-  - 1.9.3
-  - 2.0
   - 2.1
   - 2.2
   - 2.3
+  - 2.4
+  - 2.5
+  - ruby-head