Postgres comparison bugfixes between arbitrary versions - Mailing list pgsql-general

Hello,

some time ago someone published a website where it was possible to select 
two arbitrary Postgres version and then see a list of Bugfixes (and features) 
that are missing in the older version of the two. 

It was intended to help discussions with admins that are afraid of upgrading. 

But I can't find that anymore. 

Does anyone know that page and could post the link?

Thanks
Thomas