Downgrade active_support on Ruby 2.3

Author: JonRowe

Gemfile-rails-dependencies

@@ -35,6 +35,7 @@ else
   add_net_gems_dependency if version.split(' ').last < '7.0'
   gem "rails", version
   gem "sprockets", '~> 3.0' if RUBY_VERSION < '2.5'
+  gem "active_suport", "!= 2.5.6.2" if RUBY_VERSION < '2.3'
   gem "puma"
   gem 'activerecord-jdbcsqlite3-adapter', platforms: [:jruby]
   gem 'selenium-webdriver', require: false