Sync typeshed (#5071)

Michael0x2a · ilevkivskyi · commit eaa16f33ceec · 2018-05-17T10:36:21.000-04:00
Syncs typeshed, mostly to pull in some [tweaks I made][0] that makes typeshed compatible with both the current and [proposed][1] overload semantics. [0]: python/typeshed#2138 [1]: python/typing#253 (comment)
diff --git a/typeshed b/typeshed
@@ -1 +1 @@
-Subproject commit f4d19d9f612ae24dfe3e35770d7820c3bd4045d2
+Subproject commit f7f00c52af249a0a305908ba6a0016ce25d4064e
