SRE changes for 3.2.1.

Author: zorkow

upgrading/whats-new-3.2.rst

@@ -186,6 +186,20 @@ explorer to v3.  This includes summarising expressions and navigation
 of tabular expressions, like matrices or equation systems.  See the
 :ref:`keyboard command <special-keys>` documentation for details.
 
+.. _v3.2.1-sre:
+
+As of v3.2.1 MathJax pulls in SRE v4 which supports as Catalan, Danish,
+Norwegian (Bokmal and Nynorsk) and Swedish as additional languages. It also
+integrates SRE code directly making use of its promise structure, instead of
+loading it as an external package. Consequently the old `sreReady` method will
+be deprecated and the loophole to use speech rule engine directly via the `SRE`
+namespace in the browser, is closed.
+
+See the `SRE release notes
+<https://github.com/zorkow/speech-rule-engine/releases/v4.0.0>`__ as well as the
+`MathJax v3.2.1 release notes
+<https://github.com/mathjax/MathJax-src/releases/3.2.1`__ for details.
+
 -----
 
 .. _v3.2-other: