v0.0.2

Bugfix: Degenerate Polygons and the Shapely Formatter

The contours.core.shapely_formatter could not handle single point
polygons or polygons with single point holes.

• In the case of regular contours theshapely_formatter now returns
  shapely.geometry.Point objects for single point contour lines.
• In the case of filled contours the shapely_formatter now removes
  single point polygons and single point holes in polygons as they are not well
  defined for filled contours.