fix ldaps port numbers

689 -> 636

README.md

@@ -57,9 +57,9 @@ Run OpenLDAP docker image:
 
 	docker run --name my-openldap-container --detach osixia/openldap:1.2.2
 
-Do not forget to add the port mapping for both port 389 and 689 if you wish to access the ldap server from another machine.
+Do not forget to add the port mapping for both port 389 and 636 if you wish to access the ldap server from another machine.
 
-	docker run -p 389:389 -p 689:689 --name my-openldap-container --detach osixia/openldap:1.2.2
+	docker run -p 389:389 -p 636:636 --name my-openldap-container --detach osixia/openldap:1.2.2
 
 Either command starts a new container with OpenLDAP running inside. Let's make the first search in our LDAP container: