Update vendored urllib3 gitmodule to the proper git revision

tsnoam · tsnoam · commit 46d9240f3601 · 2017-07-25T22:37:58.000+03:00
Refs python-telegram-bot#720
diff --git a/telegram/vendor/ptb_urllib3 b/telegram/vendor/ptb_urllib3
@@ -1 +1 @@
-Subproject commit ddb495340152a4e51800226dc68a479e48c055ff
+Subproject commit 06d04e451f6beb5562057bf793218c4e363d8bc0
