.travis.yml in arel-mysql-index-hint-0.1.3 vs .travis.yml in arel-mysql-index-hint-0.1.4

@@ -5,7 +5,8 @@
   - 2.2.1
 script:
   - bundle install
   - bundle exec rake
 gemfile:
+  - gemfiles/activerecord_4.0.gemfile
   - gemfiles/activerecord_4.1.gemfile
   - gemfiles/activerecord_4.2.gemfile