add packages to R section

[rafapereirabr]

Hi Eduardo. Here are a few packages for spatial analysis that I thought you might wanna add to the R section.

• r5r: Rapid realistic routing on multimodal transport networks with R5
• gtfs2gps: Converting Transport Data from GTFS Format to GPS-Like Records
• geobr: Download Official Spatial Data Sets of Brazil

[sacridini]

Hi Rafael. I just added the packages to the list. Thanks a lot for your contribution! :)

[rafapereirabr]

Thanks !