.travis.yml in diff_matcher-2.7.0 vs .travis.yml in diff_matcher-2.7.1

@@ -8,11 +8,16 @@
   - rbx-19mode
   - rbx-2
   - jruby
   - ree
   - 2.0.0
-  - 2.1.1
+  - 2.1
+  - 2.2
+  - 2.3.0
   - ruby-head
+
+before_install:
+  - gem install bundler -v '1.11.2'
 
 matrix:
   fast_finish: true
   allow_failures:
     - rvm: rbx