New committer: David Rowley

Hi!

For those of you that have not read the minutes from the developer meeting
ahead of pgcon (can be found at
https://wiki.postgresql.org/wiki/PgCon_2019_Developer_Meeting), we'd like
to announce here as well that David Rowley has joined the ranks of
PostgreSQL committers.

Congratulations to David, may the buildfarm be gentle to him, and his first
revert far away!

-- 
 Magnus Hagander
 Me: https://www.hagander.net/ <http://www.hagander.net/>
 Work: https://www.redpill-linpro.com/ <http://www.redpill-linpro.com/>