Update terser-webpack-plugin (reduce memory usage)

[pustovalov]

webpack/minimizer-webpack-plugin#143
webpack/minimizer-webpack-plugin#211

webpack/webpack#10305 (comment)

Reduce memory usage for big projects around 80-90%

From contributor of terser-webpack-plugin

Upd:
https://github.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md

2.3.4 (2020-01-30)
Bug Fixes

respect stdout and stderr of workers and do not create warnings (5708574)
use webpack hash options rather than hard-code MD4(330c1f6)

[jakeNiemiec]

This will be great for the folks who transpile node_modules by default.

[njradford]

Thank you @pustovalov 👍