First draft of PG12 RC1 press release.

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+PostgreSQL 12 RC 1 Released
+===========================
+
+The PostgreSQL Global Development Group announces that the first release
+candidate of PostgreSQL 12 is now available for download. As a release
+candidate, PostgreSQL 12 RC 1 should be identical to the initial release of
+PostgreSQL 12, though some more fixes may be applied prior to the general
+availability of PostgreSQL 12.
+
+The planned date for the general availability of PostgreSQL 12 is October 3,
+2019. Please see the "Release Schedule" section for more details.
+
+Upgrading to PostgreSQL 12 RC 1
+-------------------------------
+
+To upgrade to PostgreSQL 11 RC 1 from Beta 4 or an earlier version of
+PostgreSQL 11, 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).
+
+Changes Since 12 Beta 4
+-----------------------
+
+There have been many bug fixes for PostgreSQL 12 reported during the Beta 4
+period and applied to this release candidate. These include:
+
+* Add additional "leakproof" markings to certain string functions to better support nondeterministic collations. This can positively impact the performance of some query plans
+* Removal of the ECPG `DECLARE STATEMENT` functionality
+* The ecpglib major version change was reverted
+* Fix handling of nondeterministic collations with pattern\_ops opclasses
+
+For a detailed list of fixes, please visit the
+[open items](https://wiki.postgresql.org/wiki/PostgreSQL_12_Open_Items#resolved_before_12rc1)
+page.
+
+Release Schedule
+----------------
+
+This is the first release candidate for PostgreSQL 12. Unless an issue is
+discovered that warrants a delay or to produce an additional release candidate,
+PostgreSQL 12 should be made generally available on October 3, 2019.
+
+For further information please see the
+[Beta Testing](https://www.postgresql.org/developer/beta/) page.
+
+Links
+-----
+
+* [Download](https://www.postgresql.org/download/)
+* [Beta Testing Information](https://www.postgresql.org/developer/beta/)
+* [PostgreSQL 12 RC Release Notes](https://www.postgresql.org/docs/12/static/release-12.html)
+* [PostgreSQL 12 Open Issues](https://wiki.postgresql.org/wiki/PostgreSQL_12_Open_Items)
+* [Submit a Bug](https://www.postgresql.org/account/submitbug/)