Add missing NEWS entry
diff --git a/Misc/NEWS b/Misc/NEWS
index b67420b..ff42c1b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -274,6 +274,9 @@
 Library
 -------
 
+- Issue #1705170: contextlib.contextmanager was still swallowing
+  StopIteration in some cases. This should no longer happen.
+
 - Issue #1292: On alpha, arm, ppc, and s390 linux systems the
   --with-system-ffi configure option defaults to "yes".