Update authorities.csv

Add Northgate link for Broadland District Council.

lib/uk_planning_scraper/authorities.csv

@@ -20,6 +20,7 @@ Bradford,https://planning.bradford.gov.uk/online-applications/search.do?action=a
 Brent,https://pa.brent.gov.uk/online-applications/search.do?action=advanced&searchType=Application,londonboroughs london
 Brighton and Hove,https://planningapps.brighton-hove.gov.uk/online-applications/search.do?action=advanced,england
 Bristol,https://planningonline.bristol.gov.uk/online-applications/search.do?action=advanced,england
+Broadland,https://secure.broadland.gov.uk/Northgate/PlanningExplorer/GeneralSearch.aspx,england
 Bromley,https://searchapplications.bromley.gov.uk/online-applications/search.do?action=advanced,londonboroughs london
 Bury,https://planning.bury.gov.uk/online-applications/search.do?action=advanced,england greatermanchester
 Calderdale,https://portal.calderdale.gov.uk/online-applications/search.do?action=advanced,england westyorkshire