Correctly pass max_renderers config to setup

Author: xionon

lib/react/rails/railtie.rb

@@ -74,7 +74,7 @@ class Railtie < ::Rails::Railtie
         do_setup = lambda do
           cfg = app.config.react
           React::Renderer.setup!( cfg.react_js, cfg.components_js,
-                                {:size => cfg.size, :timeout => cfg.timeout})
+                                {:size => cfg.max_renderers, :timeout => cfg.timeout})
         end
 
         do_setup.call