v0.15.1

MeshCat v0.15.1

Diff since v0.15.0

Closed issues:

• MeshCat v0.14.2 limits Rotations to v1.1.0-v1.1.1 (#214)
• Cannot establish a connection to the visualizer in Julia v1.8 (#234)

Merged pull requests:

• Constrain WebSockets.jl version to <1.6 (#235) (@ferrolho)