[doc] Update README.md for `winston-mongodb`. Fixes #35
[doc] Update README.md for `winston-mongodb`. Fixes #35

alinex/winston,aquavitae/winston,wancharle/winston,megastef/winston,nikolas/winston,winstonjs/winston,alphagov/winston,uber/winston,s-panferov/winston,DenisGorbachev/winston,apiaryio/winston,jjmleiro/winston,SmartNode-es/winston,pphetra/winston,paulhroth/winston,modulexcite/winston,dbmikus/winston,thaliproject/winston,beni55/winston,unlucio/winston,whismat/winston,get-trucked/winston,winstonjs/winston,psquickitjayant/winston,tobli/winston,z-10/winston,dustinblackman/winston,iizukanao/winston,pantheon-systems/winston,rakesh-mohanta/winston,harriha/winston,auth0/winston