Update CHANGES.txt for 3.19.2 release

CHANGES.txt

diff --git a/CHANGES.txt b/CHANGES.txt
index 926eff7..00e1b92 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,11 @@
+2022-01-05 version 3.19.2 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
+
+  Python
+  * Fix missing Windows wheel for Python 3.10 on PyPI
+
+  Java
+  * Change implementation of UnknownFieldSet (#9371)
+
 2021-10-28 version 3.19.1 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
 
   Bazel