v0.7.1

BetaML v0.7.1

Diff since v0.7.0

• solve issue #37
• initial attempt to provide plotting of a decision tree

Merged pull requests:

• 1st attempt to implement AbstractTrees-interface (#34) (@roland-KA)
• CompatHelper: add new compat entry for AbstractTrees at version 0.4, (keep existing compat) (#35) (@github-actions[bot])
• AbstractTrees-interface completed (#36) (@roland-KA)