added tmap to resources

README.md

@@ -8,10 +8,14 @@ You might also like https://git.soton.ac.uk/twr1m15/la_emissions_viz which drive
 
 ### Openstreetmap for base maps (i.e. map tiles/rasters)
 
- * [Edinburgh green space as an example](https://ourcodingclub.github.io/tutorials/spatial-vector-sf/)
- * [Madrid supermarkets](https://dominicroye.github.io/en/2018/accessing-openstreetmap-data-with-r/)
- * [Short term rentals in Halifax, Nova Scotia](https://upgo.lab.mcgill.ca/2019/12/13/making-beautiful-maps/)
+ * [Edinburgh green space as an example with sf](https://ourcodingclub.github.io/tutorials/spatial-vector-sf/)
+ * [Madrid supermarkets with sf](https://dominicroye.github.io/en/2018/accessing-openstreetmap-data-with-r/)
+ * [Short term rentals in Halifax, Nova Scotia with sf](https://upgo.lab.mcgill.ca/2019/12/13/making-beautiful-maps/)
  
 ### Google maps for base maps
 
-They want you to have an API key now. Yeah nah.
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+They want you to have an API key now. Yeah nah.
+
+### tmap package - nice - check out the bubble geom
+
+ * https://cran.r-project.org/web/packages/tmap/vignettes/tmap-getstarted.html
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