chore: update readme.md.

Author: albin3

README.md

@@ -11,7 +11,7 @@ sql grammar follows https://dev.mysql.com/doc/refman/5.7/en/select.html
 ## news
 
 - Typo 'refrence' has been fixed to 'reference' since v1.2.0.
-- Fix bug stringify keyword `having` since v1.2.1. #29
+- Fix bug stringify keyword `having` since v1.2.1. [#29](https://github.com/JavaScriptor/js-sql-parser/issues/29)
 
 for more changes see [CHANGELOG](./CHANGELOG)