.travis.yml in mongoid-path_extension-0.1.1 vs .travis.yml in mongoid-path_extension-0.1.2

@@ -1,5 +1,14 @@
 sudo: false
 language: ruby
 rvm:
   - 2.2.5
 before_install: gem install bundler -v 1.12.5
+
+matrix:
+  include:
+    - rvm: 2.3.3
+      env: MONGOID_VERSION=5
+    - rvm: 2.3.3
+      env: MONGOID_VERSION=6
+    - rvm: 2.5.0
+      env: MONGOID_VERSION=7