Hi, how to add hash version for chunk file (clear browser cache old js file) when build

# ISSUES TEMPLATE

## Version

1.2.0

## Node JS

v7.x | v8.X

## Browser

Chrome 64.x | Safari 11.x

## OS version

macOS | windows 10 | linux Ubuntu...

## Steps to reproduce

1. explantion 1...

2. explantion 2...

3. explantion 3...

## Expected behavior

What should happen

## Actual behavior

What is happening
