Update typeshed (#5408)

msullivan · web-flow · commit 509866e4c4ad · 2018-07-31T17:48:40.000-07:00
diff --git a/typeshed b/typeshed
@@ -1 +1 @@
-Subproject commit 0c9f0d21d2f7c4a8a261036752fd02b4a387d345
+Subproject commit 8b5d4708a02be803f8d0aa2b1ae1560e141998cd
