fix res partner error

lacagette_addons/lacagette_membership/models/res_partner.py

@@ -101,7 +101,7 @@ class ResPartner(models.Model):
         data = {'member_id': self.id, 'state': state}
         self.env['member.state.change'].create(data)
 
-    @api.model
+    @api.multi
     def update(self, vals):
         #_logger.info("valeurs reçues pour update partner = %s", str(vals))
         state_to_record = ""
@@ -116,7 +116,7 @@ class ResPartner(models.Model):
 
         return super(ResPartner, self).update(vals)
 
-    @api.model
+    @api.multi
     def write(self, vals):
         # _logger.info("valeurs reçues pour write partner = %s", str(vals))
         if 'cooperative_state' in vals: