[api] Accept `.stringify` option in File transport. Fixes #119. Fixes #74
[api] Accept `.stringify` option in File transport. Fixes #119. Fixes #74

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