Added missing Process fields; More accurate Optional parameters (#1483)

stdlib/3/multiprocessing/__init__.pyi

@@ -72,19 +72,26 @@ class Pool():
     def __exit__(self, exc_type, exc_val, exc_tb) -> None: ...
 
 class Process():
+    name: str
+    daemon: bool
+    pid: Optional[int]
+    exitcode: Optional[int]
+    authkey: bytes
+    sentinel: int
     # TODO: set type of group to None
     def __init__(self,
                  group: Any = ...,
-                 target: Callable = ...,
-                 name: str = ...,
+                 target: Optional[Callable] = ...,
+                 name: Optional[str] = ...,
                  args: Iterable[Any] = ...,
                  kwargs: Mapping[Any, Any] = ...,
-                 daemon: bool = ...) -> None: ...
+                 *,
+                 daemon: Optional[bool] = ...) -> None: ...
     def start(self) -> None: ...
     def run(self) -> None: ...
     def terminate(self) -> None: ...
     def is_alive(self) -> bool: ...
-    def join(self, timeout: float = ...) -> None: ...
+    def join(self, timeout: Optional[float] = ...) -> None: ...
 
 class Queue():
     def __init__(self, maxsize: int = ...) -> None: ...