.travis.yml in dynamoid-2.1.0 vs .travis.yml in dynamoid-2.2.0

- old
+ new
@@ -13,19 +13,24 @@
   - gemfiles/rails_4_0.gemfile
   - gemfiles/rails_4_1.gemfile
   - gemfiles/rails_4_2.gemfile
   - gemfiles/rails_5_0.gemfile
   - gemfiles/rails_5_1.gemfile
+  - gemfiles/rails_5_2.gemfile
 matrix:
   exclude:
     - rvm: ruby-2.0.0-p648
       gemfile: gemfiles/rails_5_0.gemfile
     - rvm: ruby-2.0.0-p648
       gemfile: gemfiles/rails_5_1.gemfile
+    - rvm: ruby-2.0.0-p648
+      gemfile: gemfiles/rails_5_2.gemfile
     - rvm: ruby-2.1.10
       gemfile: gemfiles/rails_5_0.gemfile
     - rvm: ruby-2.1.10
       gemfile: gemfiles/rails_5_1.gemfile
+    - rvm: ruby-2.1.10
+      gemfile: gemfiles/rails_5_2.gemfile
     - rvm: ruby-2.4.1
       gemfile: gemfiles/rails_4_0.gemfile
     - rvm: ruby-2.4.1
       gemfile: gemfiles/rails_4_1.gemfile
 