version 2.0
- tmaptools migrated from sp to sf, all functions support sf, but some still rely on sp
- bb now returns a vector instead of a matrix, similar to sf::st_bbox
- palette_explorer expanded with viridis palettes
- read_osm doens't support vector OSM data anymore, since the osmdata package is a better alternative

version 1.2-2
- improved smooth_map

version 1.2-1
- added threshold argument to smooth_map
- fixed bug in approx_areas (all warnings now ignored when show.warnings=FALSE)
- fixed bug in simplify_shape (ms_simplify is not case sensitive)

version 1.2
- added palette_explorer

version 1.0
- first CRAN release after package split of tmap
- non-plotting functions of tmap 1.6-1 are contained in tmaptools
- added aggregate_map
- added simplify_shape
- added approx_distances, improved approx_areas, added projection_units
- added get_brewer_pal, to get and modify brewer palettes
- added bb_sp, to convert a bounding box to a SpatialPolygons object
- sf (simple features) objects supported
