QPropertyAnimation requires QByteArray instead of a regular str for its propertyName

PySide2.QtCore.QPropertyAnimation requires the propertyName to be a byte type instead of the usual str. Easily fixable, but don't know if it was reported yet (or intended).

So:

>> QPropertyAnimation(foo, "windowOpacity")

TypeError: 'PySide2.QtCore.QPropertyAnimation' called with wrong argument types:
  PySide2.QtCore.QPropertyAnimation(PySide2.QtCore.QObject, str)
Supported signatures:
  PySide2.QtCore.QPropertyAnimation(PySide2.QtCore.QObject = nullptr)
  PySide2.QtCore.QPropertyAnimation(PySide2.QtCore.QObject, PySide2.QtCore.QByteArray, PySide2.QtCore.QObject = nullptr)

But:

>> QPropertyAnimation(foo, b"windowOpacity")

Works fine.