Fix ProgressPlugin for multi compiler caused by ES6 refactoring
Fix ProgressPlugin for multi compiler caused by ES6 refactoring

arguments can not be used within arrow functions

webpack/webpack,g0ddish/webpack,NekR/webpack,ts-webpack/webpack,SimenB/webpack,EliteScientist/webpack,ts-webpack/webpack,NekR/webpack,webpack/webpack,webpack/webpack,SimenB/webpack,ts-webpack/webpack,SimenB/webpack,webpack/webpack,g0ddish/webpack,g0ddish/webpack,EliteScientist/webpack,SimenB/webpack,ts-webpack/webpack