hpa.spatial 0.2.8

• allow user to get Modified Monash Model data (for SA1, 2016 ed.) using
  get_polygon(name = "mmm19") or get_mmm19_poly().

• bug fix: pass value_type appropriately when groups are used in
  map_data_with_correspondence().

• feature: let map_data_with_correspondence() take a list of vectors for
  groups or, when .data is passed, can take a character vector or column names
  or a vector of symbols.