Add: カスタム絵文字のエイリアス名を連合 (#135)

* Add: カスタム絵文字のエイリアス名を連合

* Fix test

app/serializers/activitypub/emoji_serializer.rb

@@ -3,9 +3,9 @@
 class ActivityPub::EmojiSerializer < ActivityPub::Serializer
   include RoutingHelper
 
-  context_extensions :emoji
+  context_extensions :emoji, :license, :keywords
 
-  attributes :id, :type, :domain, :name, :is_sensitive, :updated
+  attributes :id, :type, :domain, :name, :keywords, :is_sensitive, :updated
 
   attribute :license, if: -> { object.license.present? }
 
@@ -23,6 +23,10 @@ class ActivityPub::EmojiSerializer < ActivityPub::Serializer
     object.domain.presence || Rails.configuration.x.local_domain
   end
 
+  def keywords
+    object.aliases
+  end
+
   def icon
     object.image
   end