eol v4.0

Author: mongoKart

source/whats-new.txt

@@ -20,13 +20,27 @@ What's New
 Learn about new features, improvements, and fixes introduced in the
 following versions of the {+php-library+}:
 
+* :ref:`Version 2.1 <php-lib-version-2.1>`
 * :ref:`Version 2.0 <php-lib-version-2.0>`
 * :ref:`Version 1.21 <php-lib-version-1.21>`
 * :ref:`Version 1.20 <php-lib-version-1.20>`
 * :ref:`Version 1.19 <php-lib-version-1.19>`
 * :ref:`Version 1.18 <php-lib-version-1.18>`
 * :ref:`Version 1.17 <php-lib-version-1.17>`
 
+.. _php-lib-version-2.1:
+
+What's New in 2.1
+-----------------
+
+.. important:: Breaking Changes
+
+   The {+library-short+} v2.1 release introduces the following breaking
+   changes:
+
+   - Drops support for {+mdb-server+} 4.0. The minimum supported {+mdb-server+} version is
+     4.2.
+
 .. _php-lib-version-2.0:
 
 What's New in 2.0