tryton: link demo to credentials page

README.md

@@ -495,7 +495,7 @@ See https://github.com/n1trux/awesome-sysadmin#dns
 
 * [ERPNext](https://erpnext.com) - Free open source ERP system. ([Demo](https://demo.erpnext.com), [Source Code](https://github.com/frappe/erpnext)) `GPLv3` `Python`
 * [Odoo](http://odoo.com) - Free open source ERP system. ([Demo](https://demo.odoo.com/), [Source Code](https://github.com/odoo/odoo)) `LGPLv3` `Python`
-* [Tryton](http://www.tryton.org/) - Free open source business solution. ([Demo](http://demo.tryton.org/) admin/admin, [Source Code](https://hg.tryton.org/)) `GPLv3` `Python`
+* [Tryton](http://www.tryton.org/) - Free open source business solution. ([Demo](http://www.tryton.org/download.html), [Source Code](https://hg.tryton.org/)) `GPLv3` `Python`
 
 
 ## Federated Identity/Authentication