Add sponsors to README

README.md

@@ -6,3 +6,10 @@ OpenUpgrade
 ===========
 
 This <a href="https://odoo-community.org">OCA</a> project aims to provide an Open Source upgrade path for <a href="https://github.com/odoo/odoo">Odoo</a>. It is hosted at <a href="https://github.com/oca/openupgrade">GitHub</a>. For documentation, see <a href="https://doc.therp.nl/openupgrade">here</a>.
+
+Sponsors
+--------
+
+People, associations, companies that contributed economically to maintain this tool:
+
+* [Odoo Italia Association](https://www.odoo-italia.org/)