Make the QLineEdit.setValidator() parameter optional

#209

Author: altendky

PyQt5-stubs/QtWidgets.pyi

@@ -7177,7 +7177,7 @@ class QLineEdit(QWidget):
     def minimumSizeHint(self) -> QtCore.QSize: ...
     def sizeHint(self) -> QtCore.QSize: ...
     def validator(self) -> QtGui.QValidator: ...
-    def setValidator(self, a0: QtGui.QValidator) -> None: ...
+    def setValidator(self, a0: typing.Optional[QtGui.QValidator]) -> None: ...
     def setReadOnly(self, a0: bool) -> None: ...
     def isReadOnly(self) -> bool: ...
     def setEchoMode(self, a0: 'QLineEdit.EchoMode') -> None: ...