config.pyi: Return a Thread instance (#2945)

Fixes #2938

stdlib/2and3/logging/config.pyi

@@ -1,6 +1,7 @@
 # Stubs for logging.config (Python 3.4)
 
 from typing import Any, Callable, Dict, Optional, IO, Union
+from threading import Thread
 import sys
 if sys.version_info >= (3,):
     from configparser import RawConfigParser
@@ -23,10 +24,10 @@ if sys.version_info >= (3, 4):
                    defaults: Optional[Dict[str, str]] = ...,
                    disable_existing_loggers: bool = ...) -> None: ...
     def listen(port: int = ...,
-               verify: Optional[Callable[[bytes], Optional[bytes]]] = ...) -> None: ...
+               verify: Optional[Callable[[bytes], Optional[bytes]]] = ...) -> Thread: ...
 else:
     def fileConfig(fname: Union[str, IO[str]],
                    defaults: Optional[Dict[str, str]] = ...,
                    disable_existing_loggers: bool = ...) -> None: ...
-    def listen(port: int = ...) -> None: ...
+    def listen(port: int = ...) -> Thread: ...
 def stopListening() -> None: ...