.travis.yml in rack-app-2.3.1 vs .travis.yml in rack-app-3.0.0.alpha

@@ -4,28 +4,24 @@
 install:
   - gem update bundler
   - bundle install
 
 rvm:
+
   - 1.8
   - 1.9
-  - 2.0
-  - 2.1
+  - 2.0.0
+  - 2.1.1
+  - 2.1.2
+
   - jruby-18mode
   - jruby-19mode
   - ree
 
   - ruby-head
   - jruby-head
 
 matrix:
-  include:
-
-    - rvm: ruby-head
-      before_install:
-        - 'gem update --system 2.4.8'
-
-
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
 
 env: