add security issue

README.md

@@ -10,6 +10,8 @@ Latest release: 1.1.10 - OpenLDAP 2.4.44 -  [Changelog](CHANGELOG.md) | [Docker
 
 > OpenLDAP website : [www.openldap.org](http://www.openldap.org/)
 
+/!\ Security warning: Databases created with image version up to 1.1.10 creates two admin users with the same password, if you changed admin password after bootstrap you may be concerned by issue [issue #161](https://github.com/osixia/docker-openldap/issues/161).
+
 - [Contributing](#contributing)
 - [Quick Start](#quick-start)
 - [Beginner Guide](#beginner-guide)