ipumsr 0.8.2

• Adds codebook files to output of ipums_list_files() (#85).

• Removes deprecated ipums_list_files() arguments data_layer,
  shape_layer, and raster_layer. Use file_select instead. Also removes
  support for listing raster file types (#85).

• The "*" wildcard is no longer required to select all geographic_extents
  in define_extract_nhgis(). Instead, all available geographic extents
  are selected by default. The "*" syntax is still supported.

• Adds download_supplemental_data() to enable access to supplemental
  data files via the IPUMS API (#83).

• Fixed bug in shape_join.R that would always give the result of a
  right join no matter whether ipums_shape_left_join() or
  ipums_shape_right_join() was used (#82) (thanks @JiaZhang42!).