get_googlemap: error using download.file() with 'https://'

[nmanuben]

Since commit dd6bf2da5a54b7bf14c30afe2ce2a6b98b114499, get_googlemap() is requesting the map via http instead of https, but since download.file() is called with method = NULL (method = 'internal' in most of the cases), 'https://' URLs are not supported in most of the cases, as stated in the documentation of download.file(), and the get_googlemap() or get_map() crashes with the following message:

Error in download.file(url, destfile = destfile, quiet = !messaging,
mode = "wb") :                                 
  unsupported URL scheme

Please let me know if I'm wrong or if I can give more information.