0.3.0

New features

• Improved the default positions of demes in demesdraw.tubes()
  for tree-like models and more elaborate models with many demes.
  The previously used optimisation procedure (scipy's SLSQP) has been
  removed in favour of constrained convex optimisation using cvxpy.
• Increased the default amount of space that separates demes in
  demesdraw.tubes(), and use more space when there are more
  contemporary demes (see demesdraw.util.separation_heuristic()).
• Filter numpy warnings about overflow when using a log scale.
  The overflow in question is harmless and these warnings only serve
  to confuse users.

Breaking change

• Removed the optimisation_rounds parameter to demesdraw.tubes().