Use the most recent Rails 5.2 version

Author: lest

Gemfile.rails52

@@ -1,7 +1,7 @@
 eval_gemfile('Gemfile.global')
 
 gem 'minitest', '~> 5.8'
-gem 'rails',    '5.2.0.beta2', require: false
+gem 'rails',    '5.2.0.rc1', require: false
 gem 'activerecord-jdbcsqlite3-adapter', github: 'jruby/activerecord-jdbc-adapter', branch: 'master', platform: :jruby
 gem 'activerecord-jdbcpostgresql-adapter', github: 'jruby/activerecord-jdbc-adapter', branch: 'master', platform: :jruby
 gem 'mongoid',  github: 'mongodb/mongoid'