Type match_hostname as request by mypy

src/urllib3/packages/ssl_match_hostname/_implementation.pyi

@@ -1,3 +1,11 @@
+from typing import Dict, Tuple, Union
+
+# https://github.com/python/typeshed/blob/master/stdlib/2and3/ssl.pyi
+_PCTRTT = Tuple[Tuple[str, str], ...]
+_PCTRTTT = Tuple[_PCTRTT, ...]
+_PeerCertRetDictType = Dict[str, Union[str, _PCTRTTT, _PCTRTT]]
+_PeerCertRetType = Union[_PeerCertRetDictType, bytes, None]
+
 class CertificateError(ValueError): ...
 
-def match_hostname(cert, hostname): ...
+def match_hostname(cert: _PeerCertRetType, hostname: str) -> None: ...