Updated CHANGELOG.rst and version for release 5.3.1

Author: comrumino

CHANGELOG.rst

@@ -1,3 +1,17 @@
+5.3.1
+=====
+Date: 2023-02-21
+
+- `#527`_ Resolved timeout issue that was introduced in 5.2.1
+- `#525`_ and `#524`_ Fixed experimental thread binding struct for platforms where unsigned long is 8-bits
+
+  - While the fix for thread binding is not backwards compatible, it only impacts people using an experimental feature. Hence, I did a patch version bump.
+
+.. _#525: https://github.com/tomerfiliba-org/rpyc/pull/525
+.. _#524: https://github.com/tomerfiliba-org/rpyc/issues/524
+.. _#527: https://github.com/tomerfiliba-org/rpyc/issues/527
+
+
 5.3.0
 =====
 Date: 2022-11-25

rpyc/version.py

@@ -1,3 +1,3 @@
-__version__ = '5.3.0'
+__version__ = '5.3.1'
 version = tuple(__version__.split('.'))
-release_date = "2022-11-25"
+release_date = "2023-02-21"