v0.7.0

Breaking Change

• tilecover now returns an error (vs. panicing) on non-closed 2d geometry by @paulmach in #87

  This changes the signature of many of the methods in the maptile/tilecover package.
  To emulate the old behavior replace:

  tiles := tilecover.Geometry(poly, zoom)
  

  with

  tiles, err := tilecover.Geometry(poly, zoom)
  if err != nil {
  	panic(err)
  }
  

Full Changelog: v0.6.0...v0.7.0