feat(Message): replace referencedMessage with fetchReference (#5577)

src/errors/Messages.js

@@ -96,6 +96,7 @@ const Messages = {
   INVALID_ELEMENT: (type, name, elem) => `Supplied ${type} ${name} includes an invalid element: ${elem}`,
 
   WEBHOOK_MESSAGE: 'The message was not sent by a webhook.',
+  MESSAGE_REFERENCE_MISSING: 'The message does not reference another message',
 
   EMOJI_TYPE: 'Emoji must be a string or GuildEmoji/ReactionEmoji',
   EMOJI_MANAGED: 'Emoji is managed and has no Author.',