Sync typeshed (#5373)

Michael0x2a · web-flow · commit 0a2623016040 · 2018-07-18T13:08:54.000-07:00
This is mostly so we can get python/typeshed#2338, which unblocks #5370.
diff --git a/typeshed b/typeshed
@@ -1 +1 @@
-Subproject commit f582b53ff7de199bb3faabee02542efeb7b01690
+Subproject commit 574807d9eac34797c9bb776458e29a680b569c91
