small addition to README
small addition to README

cchantep/ReactiveMongo,viktortnk/ReactiveMongo,reactific/ReactiveMongo,avdv/ReactiveMongo,bfil/ReactiveMongo,lunatech-labs/lunatech-reactivemongo,mcveat/ReactiveMongo,ReactiveMongo/ReactiveMongo,avdv/ReactiveMongo,charleskubicek/ReactiveMongo,maowug/ReactiveMongo,maxime-gautre/ReactiveMongo,ornicar/ReactiveMongo,viktortnk/ReactiveMongo,sh1ng/ReactiveMongo,ReactiveMongo/ReactiveMongo,mcveat/ReactiveMongo,maxime-gautre/ReactiveMongo,ornicar/ReactiveMongo,charleskubicek/ReactiveMongo,maowug/ReactiveMongo,cchantep/ReactiveMongo