v2.8.0

RootedTrees v2.8.0

Diff since v2.7.0

Closed issues:

• Finalize and publish API on partitions and splittings (forests, skeletons) (#24)
• Support rooted trees with multiple types of nodes (#28)

Merged pull requests:

• first draft of ColoredRootedTree (#54) (@ranocha)
• simplify CI cache (#57) (@ranocha)
• introduce RungeKuttaMethod (#58) (@ranocha)
• docs (#60) (@ranocha)