Added mongodb to travis
Added mongodb to travis

yakovenkodenis/searchkick,karthik-mallavarapu/searchkick,jaredcwhite/searchkick,klebervirgilio/searchkick,Fablic/searchkick,bukalapak/searchkick,incorvia/searchkick,jaredcwhite/searchkick,richardking/searchkick,mikelkew/searchkick,nviennot/searchkick,jprosevear/searchkick,kevin-klein/searchkick,pluton-house/searchkick,moneyadviceservice/searchkick,klebervirgilio/searchkick,meetrajesh/searchkick,bukalapak/searchkick,kevin-klein/searchkick,bodiam/searchkick,yardclub/searchkick,meetrajesh/searchkick,Ribeiro/searchkick,instacart/searchkick,mehulkar/searchkick,st0012/searchkick,johan--/searchkick,edatrix/searchkick,yakovenkodenis/searchkick,seuros/searchkick,jprosevear/searchkick,joe1chen/searchkick,elguapo1611/searchkick,elguapo1611/searchkick,DmitryKK/searchkick,Pathgather/searchkick,Fablic/searchkick,edatrix/searchkick,seuros/searchkick,moneyadviceservice/searchkick,bodiam/searchkick,pluton-house/searchkick,Xtinct/searchkick,giangnguyennet/searchkick,savayg/searchkick,karthik-mallavarapu/searchkick,ankane/searchkick,savayg/searchkick,yardclub/searchkick,richardking/searchkick,nviennot/searchkick,johan--/searchkick,mikelkew/searchkick,st0012/searchkick,DmitryKK/searchkick,joe1chen/searchkick,Xtinct/searchkick,instacart/searchkick,spanner/searchkick,Altareq/searchkick,Altareq/searchkick,incorvia/searchkick,Ribeiro/searchkick,giangnguyennet/searchkick,mehulkar/searchkick,spanner/searchkick