.travis.yml in gon-6.2.1 vs .travis.yml in gon-6.3.1

@@ -3,10 +3,10 @@
 env:
   - "RABL_GEM=rabl"
   - "RABL_GEM=rabl-rails"
 
 rvm:
-  - 2.3.3
-  - 2.4.0
+  - 2.2.10
+  - 2.3.7
+  - 2.4.4
+  - 2.5.1
   - ruby-head
-# uncomment this line if your project needs to run something other than `rake`:
-# script: bundle exec rspec spec