Add roadmap management to Site settings (#123)

app/controllers/post_statuses_controller.rb

@@ -75,6 +75,6 @@ class PostStatusesController < ApplicationController
     def post_status_params
       params
         .require(:post_status)
-        .permit(:name, :color)
+        .permit(:name, :color, :show_in_roadmap)
     end
 end

app/controllers/site_settings_controller.rb

@@ -11,4 +11,7 @@ class SiteSettingsController < ApplicationController
 
   def post_statuses
   end
+
+  def roadmap
+  end
 end