terrainr v 0.3.1

terrainr 0.3.1

• First CRAN release!
• This is the smallest of patch releases, with almost no user-facing changes.
• Internal changes:
  • Added rOpenSci reviewers to DESCRIPTION.
  • Changed USGS API link to new website.
  • Added rOpenSci badge to README.
  • Changed most PNG images to slightly smaller JPGs.
  • Edited URLs for new rOpenSci website.
  • Moved lifecycle badge href to new site.
  • Some small spelling issues have been fixed.
  • Added \value tags to non-exported point_to_distance and
    terrainr_bounding_box functions
  • Added single quotes around Unity in the DESCRIPTION