.travis.yml in mongoid-history-0.4.7 vs .travis.yml in mongoid-history-0.5.0

@@ -5,14 +5,16 @@
 language: ruby
 
 cache: bundler
 
 rvm:
+  - 2.2
   - 2.1.1
   - 2.0.0
   - 1.9.3
   - rbx-2.2.10
   - jruby-19mode
 
 env:
   - MONGOID_VERSION=3
   - MONGOID_VERSION=4
+  - MONGOID_VERSION=5