updated README: added Chris Keller as contributor
updated README: added Chris Keller as contributor

thechadwix/FusionTable-Map-Template,kevinrak9/r2w_map_spanish,cmpbrown/ga-enviro,fairfaxdup/FusionTable-Map-Template-gh-pages,machewgc/fullseats,fairfaxdup/FusionTable-Map-Template-gh-pages,mcheck/fusion-map-search,ZachMoreno/YourCoast,tmartyny/EarlyOakland,chihacknight/lsc-voting-areas,codeforamerica/Somerville-Child-Care-Map,ZachMoreno/YourCoast,pambroviak/washkowiak,danielk123/FusionTable-Map-Template,mcheck/fusion-map-search,pambroviak/washkowiak,machewgc/fullseats,cmpbrown/ga-enviro,thechadwix/FusionTable-Map-Template,sfbrigade/EarlySanFrancisco,kevinrak9/r2w_map_spanish,codeforamerica/Somerville-Child-Care-Map,danielk123/FusionTable-Map-Template,tmartyny/EarlyOakland,chihacknight/lsc-voting-areas