SlintPlot 0.4.1

Fixed

• SegmentedRingChart: the gaps between segments are as wide in every ring,
  with parallel sides, and at least 2px. They were a share of each segment's
  angle, so they widened outwards and, on screens of 1 pixel per point such
  as most Linux desktops and browsers, looked uneven where they were under 2
  pixels. segment-gap is now a share of a segment of the inner ring.