Merge pull request #526 from molawson/fix-to_prepare-deprecation

Fix Rails 5 .to_prepare deprecation warning

Author: Robert Mosolgo

lib/react/rails/railtie.rb

@@ -85,7 +85,11 @@ class Railtie < ::Rails::Railtie
 
         React::ServerRendering.reset_pool
         # Reload renderers in dev when files change
-        ActionDispatch::Reloader.to_prepare { React::ServerRendering.reset_pool }
+        if Gem::Version.new(::Rails::VERSION::STRING) >= Gem::Version.new("5.x")
+          ActiveSupport::Reloader.to_prepare { React::ServerRendering.reset_pool }
+        else
+          ActionDispatch::Reloader.to_prepare { React::ServerRendering.reset_pool }
+        end
       end
 
       initializer "react_rails.setup_engine", :group => :all do |app|