v2.1.0

- [pointPen] Added ReverseContourPointPen, copied from defcon (#73).
- [pointPen] The beginPath and addComponent methods of AbstractPointPen
  now take extra **kwargs (like addPoint does). These are used to pass on
  identifiers or other private attributes of contours/components (869a8f6).
- [pointPen] The PointToSegmentPen.addComponent method accepts (ignores)
  extra **kwargs, to silence deprecation warnings in defcon (#72).
- [pointPen] Added identifier=None argument in AbstractPointPen.beginPath,
  addPoint and addComponent methods (#63).

2.0.0

First public release with UFO3 support.