Fix typo

Author: jason-fox

lib/errors.js

@@ -6,8 +6,7 @@
  * fiware-iotagent-lib is free software: you can redistribute it and/or
  * modify it under the terms of the GNU Affero General Public License as
  * published by the Free Software Foundation, either version 3 of the License,
- * or {
- constructor(at your option) any later version.
+ * or (at your option) any later version.
  *
  * fiware-iotagent-lib is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of