[fix] stop testing 0.6 and start testing 0.10 on travis
[fix] stop testing 0.6 and start testing 0.10 on travis

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