Version 0.4.3

Bug fixes

• Fix axis label order in clustree() (Fixes #44)
• Add checks to handle features including "-" characters for Seurat and SingleCellExperiment interfaces to clustree() and clustree_overlay() (Fixes #43)
• Change how metadata columns are extracted for compatibility with tibble objects (Fixes #52)

Other changes

• Replace the iris_clusts dataset with the nba_clusts dataset
• Increase R dependency to > 3.5