replaced key by a list of keys in update_mongo_collection
replaced key by a list of keys in update_mongo_collection

MichelJuillard/dlstats,Widukind/dlstats,Widukind/dlstats,mmalter/dlstats,mmalter/dlstats,MichelJuillard/dlstats,MichelJuillard/dlstats,mmalter/dlstats