geojsonio 0.11.0

Breaking changes

• SpatialPolygonsDataFrame inputs are now cast to sf before being written out to
  fix ring ordering. This was previously handled by maptools, which is being
  retired. Outputs are visually identical, but underlying representations may
  have changed.
• Functions relying on rgeos (such as those writing rgeos objects to file) are
  defunct. PRs to replace these using the newer geos package are welcomed.

New features

• topojson_write() has been restored, and now supports conversion to topoJSON
  formats. User reports indicate output files might be larger than anticipated;
  PRs to address this are welcomed. Huge thanks to @Shaunson26 for this PR!

Other changes

• The rgeos and maptools packages have been removed from Imports. (Thanks to
  Roger Bivand and Mike Sumner on Mastodon!)