Add meta to catalog

db/migrate/2_create_shotengai_catalogs.rb

@@ -4,6 +4,7 @@ class CreateShotengaiCatalogs < ActiveRecord::Migration[5.1]
       t.string :name
       t.string :level_type
       t.string :image
+      t.json :meta
       # STI
       t.string :type
       t.references :super_catalog, index: true

lib/shotengai/catalog.rb

@@ -7,6 +7,7 @@ module Shotengai
   #  name             :string(255)
   #  level_type       :string(255)
   #  image            :string(255)
+  #  meta              :json
   #  type             :string(255)
   #  super_catalog_id :integer
   #  created_at       :datetime         not null