.travis.yml in gon-5.2.3 vs .travis.yml in gon-6.0.0

@@ -1,10 +1,11 @@
 language: ruby
+sudo: false
 rvm:
   - 1.9.3
   - 2.0.0
-  - 2.1.0
-  - 2.1.4
+  - 2.1.6
+  - 2.2.2
   - jruby-19mode # JRuby in 1.9 mode
   - rbx
 matrix:
   allow_failures:
     - rvm: rbx