PL/Java 1.5.2 - fixes one regression in date conversion in 1.5.1

---
Note to packagers - please make sure the newly-added file
$sharedir/pljava/pljava--1.5.1--1.5.2.sql will be installed, alongside
those from prior releases. It is found in the
pljava-packaging/target/pljava-*.jar file but not in any build directory (it
gets added
synthetically to the jar file based on a template).
---

PL/Java 1.5 brings functions, triggers, and types in Java to PostgreSQL
releases from 11 back to 8.2. Release 1.5.2 fixes a regression in 1.5.1
that affected the conversion of PostgreSQL date values to Java java.sql.Date
objects.

Project site: http://tada.github.io/pljava/
Release notes: http://tada.github.io/pljava/releasenotes.html

## Change

Before 1.5.1, PostgreSQL date, time, and timestamp values could be accessed
in PL/Java as java.sql.Date, java.sql.Time, and java.sql.Timestamp objects.
PL/Java 1.5.1 added the option of accessing those values as objects of new
classes in the Java 8+ java.time package. The new classes are recommended as
a superior API for accessing dates, times, and timestamps.

However, one regression resulted in the older conversion between PostgreSQL
date and java.sql.Date, leading to an error of one day for some dates of the
year in some time zones. Release 1.5.2 restores the former behavior.

Please see the release notes for more complete information.

Availability:

1.5.2 is available from GitHub as a source release, which builds quickly
using Maven:

Release page: https://github.com/tada/pljava/releases/tag/V1_5_2

This wiki page will add links to prebuilt packages that become available:
https://github.com/tada/pljava/wiki/Prebuilt-packages