add missing uvloop members to uvloop/__init__.pyi

Author: graingert

Diff for: uvloop/__init__.pyi

@@ -5,10 +5,25 @@ from collections.abc import Callable, Coroutine
 from contextvars import Context
 from typing import Any, TypeVar
 
-
 _T = TypeVar('_T')
 
 
+class Loop(AbstractEventLoop):
+    ...
+
+
+def new_event_loop() -> Loop:
+    ...
+
+
+def install() -> None:
+    ...
+
+
+class EventLoopPolicy(asyncio.AbstactEventLoopPolicy):
+    ...
+
+
 def run(
     main: Coroutine[Any, Any, _T],
     *,