.travis.yml in mongoid-compatibility-0.4.1 vs .travis.yml in mongoid-compatibility-0.5.0

@@ -6,9 +6,12 @@
     - rvm: 2.3.1
       script:
         - bundle exec danger
     - rvm: 2.4.0
       env:
+        - MONGOID_VERSION=7
+    - rvm: 2.4.0
+      env:
         - MONGOID_VERSION=6
     - rvm: 2.3.1
       env:
         - MONGOID_VERSION=6
     - rvm: 2.3.1