Update pytype blacklist (#422)

tests/pytype_blacklist.txt

@@ -4,13 +4,11 @@
 2.7/builtins.pyi
 2.7/codecs.pyi
 2.7/inspect.pyi
-2.7/ssl.pyi
-2.7/StringIO.pyi
 2.7/types.pyi
 2.7/typing.pyi
 2.7/unittest.pyi
 2and3/argparse.pyi
 2and3/logging/handlers.pyi
 2and3/logging/__init__.pyi
-2and3/warnings.pyi
+2and3/mmap.pyi
 2and3/webbrowser.pyi