.travis.yml in robot-controller-2.0.2 vs .travis.yml in robot-controller-2.0.3

@@ -1,7 +1,11 @@
 notifications:
   email: false
 
+sudo: false
+cache: bundler
+
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.2
+  - 2.2.1