Sync typeshed (#4262)

gvanrossum · web-flow · commit 81e2cad13ab6 · 2017-11-19T08:56:16.000-08:00
diff --git a/typeshed b/typeshed
@@ -1 +1 @@
-Subproject commit 533a05be45a83040b4ca561d80f51ebe4edc74c4
+Subproject commit 821c765991a32f6fb40b0a52029986db45de06e8
