lwgeom no longer exports st_make_valid

[edzer]

... but sf does. This will break hereR with e.g.

  > test_check("hereR")
  ── 1. Error: isoline works  ────────────────────────────────────────────────────
  'st_make_valid' is not an exported object from 'namespace:lwgeom'
  Backtrace:
   1. hereR::isoline(poi = poi, aggregate = TRUE)
   2. lwgeom::st_make_valid
   3. base::getExportedValue(pkg, name)

Please fix and resubmit to CRAN to avoid errors in CRAN checks.

[munterfi]

Thanks for reporting - fixed and resubmitted to CRAN.