Update CHANGELOG for v22.1

Change-Id: If00a4a264a69c93df4bfbbea686913c9488fc521
diff --git a/CHANGELOG b/CHANGELOG
index 36136a7..19f75ba 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -9,6 +9,14 @@
     *
 
 
+v22.1 - 2021-12-07:
+  Tracing service and probes:
+    * Added workaround for a Linux kernel bug causing some ftrace strings to
+      be non-null-terminated (https://github.com/torvalds/linux/commit/f0a5157).
+  Trace Processor:
+    * Fixed build failures on Windows.
+
+
 v22.0 - 2021-12-03:
   Tracing service and probes:
     * Added Android SDK version to the SystemInfo trace packet.