.travis.yml in trix-rails-1.0.1 vs .travis.yml in trix-rails-2.0.0

@@ -6,9 +6,10 @@
 gemfile:
   - gemfiles/rails_4.2.gemfile
   - gemfiles/rails_5.0.gemfile
   - gemfiles/rails_5.1.gemfile
   - gemfiles/rails_5.2.gemfile
+  - gemfiles/rails_5.2.1.gemfile
   - gemfiles/rails_master.gemfile
 matrix:
   allow_failures:
     - gemfile: 'gemfiles/rails_master.gemfile'
 before_install: gem install bundler -v 1.11.2