[UPDATE]

base_user_gravatar/README.rst

@@ -18,7 +18,7 @@ To configure this module, you need to:
 
 .. image:: https://odoo-community.org/website/image/ir.attachment/5784_f2813bd/datas
    :alt: Try me on Runbot
-   :target: https://runbot.odoo-community.org/runbot/{repo_id}/{branch}
+   :target: https://runbot.odoo-community.org/runbot/149/8.0
 
 .. repo_id is available in https://github.com/OCA/maintainer-tools/blob/master/tools/repos_with_ids.txt
 .. branch is "8.0" for example

base_user_gravatar/__openerp__.py

@@ -4,7 +4,7 @@
 
 {
     'name': 'Synchronize Gravatar image',
-    'version': '1',
+    'version': '8.0.1.0.0',
     'author': 'Endika Iglesias, Odoo Community Association (OCA)',
     'category': 'Tools',
     'website': 'http://www.endikaiglesias.com/',

base_user_gravatar/models/res_users.py

@@ -32,6 +32,6 @@ class ResUsers(models.Model):
             self.write({'image': user_gravatar})
         else:
             raise Warning(
-                _("You don't have Gravatar image to this %s email." % (
+                _("There is no Gravatar image for this email (%s)" % (
                     email)))
         return True