Psycopg 3.1 released

Hello,

After several months of development, we are proud to announce the
release of Psycopg 3.1!

Psycopg 3.1 adds several features to the previous Psycopg 3.0 line:

- massive performance improvements thanks to the pipeline mode
- easier porting from psycopg2 thanks to client-side-binding cursors
- faster executemany, optionally returning results
- a flexible enum adaptation
- two-phase commit support

...and many other features. For more details about each of the new
features please check out the release notes at
<https://www.psycopg.org/articles/2022/08/30/psycopg-31-released/>.

We wish to thank wholeheartedly everyone who contributed to the
Psycopg 3.1 release, especially Denix Laxalde, who worked very hard on
the pipeline mode and provided his intelligence, experience and
patience all along the development.

Looking forward to your feedback. Happy hacking!

-- Daniele