getting cran comments ready for release

cran-comments.md

@@ -1,22 +1,23 @@
-## Resubmission
-This is a resubmission. In this version I have:
-
-* corrected the use of backticks and quotes for functions and software nawes in DESCRIPTION.
+## Test environments
+* local R installation (Ubuntu 20.04), R 4.0.0
+* Github Actions, macOS-latest, R 4.0.0
+* Github Actions, window-latest, R 4.0.0
+* Github Actions, Ubuntu 16.04, R 4.0.0
+* Github Actions, Ubuntu 16.04, R 3.6.0
+* Github Actions, Ubuntu 16.04, R 3.5.0
+* Github Actions, Ubuntu 16.04, R 3.4.0
+* Github Actions, Ubuntu 16.04, R 3.3.0
 
+mac-OS latest with R-devel fails in Github Actions, but I believe that this is because no binary version of sf is available for it. 
 
-## Test environments
-* local Ubuntu 16.04 install, R 3.4.1
-* ubuntu 14.04.5 (on travis-ci), R 3.4.0
-* win-builder (devel and release)
+Please note that, due to dependency conflicts for `sf` 0.9, testing may fail in some environments. It is in particular the case for rhub, which does not allow to use the ubuntugis-unstable PPA necessary to get the necessary versions of GDAL, GEOS and PROJ4 for sf 0.9. This is why I favored Github Actions. 
 
 ## R CMD check results
-There were no ERRORs or WARNINGs.
 
-There was 1 NOTE on win-builder:
+0 errors | 0 warnings | 0 note
+
+* This is a new release.
+
+## Downstream dependencies
 
-* checking CRAN incoming feasibility ... NOTE
-  Maintainer: 'Joël Gombin <joel.gombin@gmail.com>'
-  New submission
-  Possibly mis-spelled words in DESCRIPTION:
-    concaveman (11:19, 11:50)
-    mapbox (11:115)
+I ran `revdepcheck::revdep_check()`. There is no problem with the downstream dependencies.