v0.15.1

PhyloNetworks v0.15.1

Diff since v0.15.0

Merged pull requests:

• CompatHelper: bump compat for Functors to 0.3, (keep existing compat) (#178) (@github-actions[bot])
• Error when the network has negative or missing branches for phylolm (#180) (@pbastide)
• removedegree2nodes! : option to keep the root (#181) (@cecileane)