.travis.yml in trix-rails-0.11.4.1 vs .travis.yml in trix-rails-1.0.0

@@ -1,13 +1,14 @@
 language: ruby
 rvm:
-  - 2.2.7
   - 2.3.4
   - 2.4.1
+  - 2.5.1
 gemfile:
   - gemfiles/rails_4.2.gemfile
   - gemfiles/rails_5.0.gemfile
   - gemfiles/rails_5.1.gemfile
+  - gemfiles/rails_5.2.gemfile
   - gemfiles/rails_master.gemfile
 matrix:
   allow_failures:
     - gemfile: 'gemfiles/rails_master.gemfile'
 before_install: gem install bundler -v 1.11.2