v0.6.1

ApproxManifoldProducts v0.6.1

Diff since v0.6.0

Merged pull requests:

• overload statistics mean var std cov (#211) (@dehann)
• minor improvements (#212) (@dehann)
• some cleanup on rotations, and compat Rotations (#214) (@dehann)
• Update ci to test julia 1.8 (#215) (@Affie)
• drop depr TransformUtils R mat (#216) (@dehann)
• v0.6.1-rc1 (#217) (@dehann)