Update Qt.py

[mottosso]

Updating README, tests and version

[mottosso]

Tests for the PySide6 transition is not working. 😭 Help needed, we need to ensure that code written for PySide6 also runs on PySide2 and vice versa, and these two points are the start of that:

• https://github.com/mottosso/Qt.py/pull/403/files#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5R605

[mottosso]

These tests should work for every binding.

def test_midbutton_qt6():
    """QtCore.MidButton was renamed QtCore.MiddleButton in Qt 6"""
    from Qt import QtCore, QtCompat

    if binding("PySide6"):
        assert QtCompat.Qt.MidButton == QtCore.Qt.MiddleButton
    else:
        assert QtCompat.Qt.MidButton == QtCore.Qt.MidButton


def test_set_font_weight():
    """Qt 6 changed font weights from integers to enums"""
    from Qt import QtGui, QtCompat
    font = QtGui.QFont()
    QtCompat.QFont.setWeight(font, 400)

[mottosso]

This seems solid, but QtCompat for upgrading is still wip.