.travis.yml in mongoid-locker-0.3.4 vs .travis.yml in mongoid-locker-0.3.5

@@ -1,18 +1,34 @@
+services:
+  - mongodb
+
 language: ruby
 
-rvm:
-  - 1.9.3
-  - 2.1.2
-  - 2.2
-  - jruby-19mode
-  - rbx-2
+cache: bundler
 
-services: mongodb
+before_install:
+  - gem update --system
+  - gem install bundler
 
-env:
-  - MONGOID_VERSION=2
-  - MONGOID_VERSION=3
-  - MONGOID_VERSION=4
-  - MONGOID_VERSION=5
+matrix:
+  include:
+    - rvm: 2.3.1
+      env: MONGOID_VERSION=2
+    - rvm: 2.3.1
+      env: MONGOID_VERSION=3
+    - rvm: 2.3.1
+      env: MONGOID_VERSION=4
+    - rvm: 2.3.1
+      env: MONGOID_VERSION=5
+    - rvm: 2.3.1
+      env: MONGOID_VERSION=6
+      before_script:
+        - bundle exec danger
+    - rvm: rbx-2
+    - rvm: ruby-head
+    - rvm: jruby-head
+  allow_failures:
+    - rvm: ruby-head
+    - rvm: jruby-head
+    - rvm: rbx-2
 
-cache: bundler
+bundler_args: --without development