Sync typeshed (#6016)

JukkaL · ilevkivskyi · commit 0b2abe46f518 · 2018-12-05T18:14:52.000Z
This brings in a fix to the TypedDict `has_key` signature (python/typeshed#2672).
diff --git a/mypy/typeshed b/mypy/typeshed
@@ -1 +1 @@
-Subproject commit c8890b0f930c1a8db45c9a2cd93540cb1aa1b0de
+Subproject commit 184148611a2882ab53f83ef420ce1b95cee808bc
