[fix] Log to `winston.log` when only `dirname` option is passed in. Fixes #193.
[fix] Log to `winston.log` when only `dirname` option is passed in. Fixes #193.

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