Update multi_json dependency to version 1.7.5
Update multi_json dependency to version 1.7.5

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