last_clade(), last_rank() and all_clades() are now deprecated in favor
of get_last_clade(), get_last_rank() and get_all_clades() (#11).
New functions get_clade() (#12) and is_at_least_rank().
New dataset all_ranks.
Add trim_void(), trim_rank() and trim_common() functions.
Remove ggtree from suggested packages.
all_clades() behavior has changed for duplicated clades.
Consecutive underscores are not allowed anymore.
Documentation improved.
Compatible with R 4.0.0.
Continuous integration with both release and development R versions.
yatah.