.travis.yml in webhook_system-2.1.3 vs .travis.yml in webhook_system-2.1.4

@@ -1,16 +1,22 @@
 language: ruby
 rvm:
   - 2.1.8
   - 2.2.4
   - 2.3.0
+  - 2.5.3
+  - 2.6.3
 
 gemfile:
   - gemfiles/rails_4.gemfile
   - gemfiles/rails_5.gemfile
+  - gemfiles/rails_5_2.gemfile
 
+
 matrix:
   exclude:
   - rvm: 2.1.8
     gemfile: gemfiles/rails_5.gemfile
+  - rvm: 2.1.8
+    gemfile: gemfiles/rails_5_2.gemfile
 
 script: "bundle exec rspec"