update utilities.reverse_geocode to use geopandas#57

Herald-TUOS merged 9 commits intodevelopSheffieldSolar/Geocode:developfrom

6-use-geopandas-for-geocoding-to-lsoa-and-gspSheffieldSolar/Geocode:6-use-geopandas-for-geocoding-to-lsoa-and-gspCopy head branch name to clipboard