v4.0.0

• Define tessellation of collinear input, returning an empty result with an ordered hull instead of throwing an error. Allows building Voronoi tessellation for degenerate cases. #47 (by @Fil)
• Added an update method for updating the triangulation after changing coords in place (useful for iterative relaxation algorithms). #48
• Improved performance by ~5-10%. #35
• Fixed a rare race condition that could lead to an infinite loop. #49