#16307: Fix multiprocessing.Pool.map_async not calling its callbacks

Patch by Janne Karila.
diff --git a/Misc/NEWS b/Misc/NEWS
index e0a54cb..9766633 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -49,6 +49,9 @@
 Library
 -------
 
+- Issue #16307: Fix multiprocessing.Pool.map_async not calling its callbacks.
+  Patch by Janne Karila.
+
 - Issue #16250: Fix URLError invocation with proper args.
 
 - Issue #16116: Fix include and library paths to be correct when building C