Add restrictions relation to format resource.

Author: plural

app/resources/api/v3/public/format_resource.rb

@@ -9,8 +9,9 @@ class Api::V3::Public::FormatResource < JSONAPI::Resource
 
         paginator :none
 
-        has_many :snapshots
         has_many :card_pools
+        has_many :restrictions
+        has_many :snapshots
       end
     end
   end