Update CHANGELOG.md

CHANGELOG.md

@@ -6,6 +6,7 @@ All notable changes to this project will be documented in this file. The format
 ### Added
 - Add an argument to disable the (default) expansion of the points-array of a mesh in `mesh.expand(expand_dim=True)` and `mesh.revolve(expand_dim=True)`. E.g., this allows the expansion and / or revolution of a quad-mesh with points in 3d-space.
 - Add `MultiPointContact.plot(offset=0, **kwargs)` to plot the rigid contact plane(s) or line(s) at a given offset.
+- Add `MultiPointConstraint.plot(**kwargs)` to plot the lines of a multi-point constraint.
 
 ### Changed
 - Don't raise an error if the total angle of revolution is greater than 360 degree in `mesh.revolve(phi=361)`.