.travis.yml in mongoid-history-0.8.0 vs .travis.yml in mongoid-history-0.8.1

@@ -10,9 +10,10 @@
 env:
   - MONGOID_VERSION=3
   - MONGOID_VERSION=4
   - MONGOID_VERSION=5
   - MONGOID_VERSION=6
+  - MONGOID_VERSION=7
   - MONGOID_VERSION=HEAD
 
 rvm:
   - 2.3.1