Add pyqtBoundSignal.__getitem__() for signal indexing

#9

Author: altendky

PyQt5-stubs/QtCore.pyi

@@ -30,6 +30,8 @@ import datetime
 class pyqtBoundSignal:
     signal = ... # type: str
 
+    def __getitem__(self, key: object) -> "pyqtBoundSignal": ...
+
     def emit(self, *args: typing.Any) -> None: ...
     def connect(self, slot: "PYQT_SLOT") -> "QMetaObject.Connection": ...
     def disconnect(self, slot: typing.Union["PYQT_SLOT", "QMetaObject.Connection"]=None) -> None: ...