.travis.yml in mutant-0.7.3 vs .travis.yml in mutant-0.7.4

@@ -1,11 +1,12 @@
+sudo: false
 language: ruby
 script: "bundle exec rake ci"
 env:
   - TRAVIS=true
 rvm:
-  - 2.0.0
-  - 2.1.4
+  - '2.0'
+  - '2.1'
   - rbx-2
 matrix:
   allow_failures:
     - rvm: rbx-2 # travis does not maintain rbx setup correctly
 notifications: