Alpha version 0.3.0

Breaking changes:

• scatter and scatter3 take xs, ys, (zs), and color as series tuples in
  positional arguments.
• removed function plot type (since scatter is now much easier to use).

New:

• scatter and scatter3 accept cs, an array of colors (one for each point), and
  plot using them, using weighted averaging to combine plots.
• scatter and scatter3 now accept multiple series at once.
• special series for X/Y/Z axes.
• some new examples (deigned by Gemini 2.5 pro): voronoi, dashboard,
  mandelbrot.