Log Message:
Update to 4.5.1. Changes since 4.5:

* Only convert exact dicts to a QVariantMap and back and not dict
  sub-classes.
* Removed an assertion when building dynamic meta-objects, instead just
  ignore the attribute if it doesn't have the expected type.
* Fixed the handling of QWizard by pyuic.
* Changed the SIP dependency to v4.8.1 (not necessary but we don't want it
  to survive in the wild).
* Changed the roadmap to show how incompatible APIs will be selected.
* Fixed __str__ for QByteArray for Python v3 so it is consistent with
  Python v2.
* Reverted the roadmap change about __hash__ being an incompatibile change.
  The issue isn't that the hash function has changed (which isn't considered
  a compatibility problem) it's that different objects that previously had a
  different hash value (based on their id()) now might have the same hash
  value.
* Updated the roadmap to show that the __hash__ additions (including QUrl)
  are not now considered incompatible changes.
* Removed the Python v3 buffer protocol support for QString.
* Improved the implementation of the Python v3 buffer protocol for QByteArray.
* Fixed a pyuic problem with Python v3 when setting the tab order.
* Added /Transfer/ to QComboBox.setLineEdit().
* Added /KeepReference/ to setValidator() and setCompleter() for QLineEdit
  and QComboBox.
* Added the missing setCoordinateMode() and coordinateMode() methods from
  QGradient.