Update to PostgreSQL-12b4

The PostgreSQL Global Development Group announces that the fourth beta
release of PostgreSQL 12 is now available for download. This release
contains previews of all features that will be available in the final
release of PostgreSQL 12, though some details of the release could
change before then.

This is likely the final beta release of PostgreSQL 12 before a release
candidate is made available.

In the spirit of the open source PostgreSQL community, we strongly
encourage you to test the new features of PostgreSQL 12 in your database
systems to help us eliminate any bugs or other issues that may exist.

Upgrading to PostgreSQL 12 Beta 4

To upgrade to PostgreSQL 12 Beta 4 from Beta 3 or an earlier version of
PostgreSQL 12, you will need to use a strategy similar to upgrading
between major versions of PostgreSQL (e.g. pg_upgrade or pg_dump /
pg_restore). For more information, please visit the documentation
section on upgrading:

https://www.postgresql.org/docs/12/static/upgrading.html

URL: https://wiki.postgresql.org/wiki/PostgreSQL_12_Open_Items#resolved_before_12beta4