message: add MANAGE_MESSAGES permission to bot invite link
diff: @@ -145,7 +145,8 @@ export class Util {
  Permissions.FLAGS.EMBED_LINKS |
  Permissions.FLAGS.ATTACH_FILES |
  Permissions.FLAGS.READ_MESSAGE_HISTORY |
  - Permissions.FLAGS.MANAGE_WEBHOOKS;
  + Permissions.FLAGS.MANAGE_WEBHOOKS |
  + Permissions.FLAGS.MANAGE_MESSAGES;
  /* tslint:enable:no-bitwise */
  const clientId = config.auth.clientID;
  