.travis.yml in ridley-3.1.0 vs .travis.yml in ridley-4.0.0

@@ -4,9 +4,10 @@
   - TEST_SUITE=unit
   - TEST_SUITE=acceptance
 rvm:
   - 1.9.3
   - 2.0.0
+  - 2.1
   - jruby-19mode
 matrix:
   allow_failures:
     - rvm: jruby-19mode