Update multi_json dependency to version 1.7.9
Update multi_json dependency to version 1.7.9

BryanH/follow-all,codeforamerica/follow-all,jasnow/follow-all,BryanH/follow-all,BryanH/follow-all,jasnow/follow-all,codeforamerica/follow-all,jasnow/follow-all,codeforamerica/follow-all