Add more stubs to redis (pubsub and monitor) (#3442)

third_party/2and3/redis/client.pyi

@@ -277,6 +277,10 @@ class Redis(object):
     def script_kill(self): ...
     def script_load(self, script): ...
     def register_script(self, script): ...
+    def pubsub_channels(self, pattern: Text = ...) -> List[Text]: ...
+    def pubsub_numsub(self, *args: Text) -> List[Tuple[Text, int]]: ...
+    def pubsub_numpat(self) -> int: ...
+    def monitor(self) -> Monitor: ...
 
 StrictRedis = Redis
 
@@ -350,3 +354,10 @@ class Script:
     sha: Any
     def __init__(self, registered_client, script) -> None: ...
     def __call__(self, keys=..., args=..., client=...): ...
+
+class Monitor(object):
+    def __init__(self, connection_pool) -> None: ...
+    def __enter__(self) -> Monitor: ...
+    def __exit__(self, *args: Any) -> None: ...
+    def next_command(self) -> Dict[Text, Any]: ...
+    def listen(self) -> Iterable[Dict[Text, Any]]: ...