build: update terser-webpack-plugin to version 2.1.0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
terser-webpack-plugin	dependencies	minor	2.0.1 -> 2.1.0

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Release Notes

webpack-contrib/terser-webpack-plugin

v2.1.0

Compare Source

Bug Fixes

• correct interpretation url for extracted comment file (#​157) (aba8ba7)

Features

• emit warning when comment file conlict with an existing asset (#​156) (2b4d2a4)
• improve naming of extracted file with comments (#​154) (5fe3337)

2.0.1 (2019-09-06)

Bug Fixes

• reduce memory usage (#​145) (815e533)
• revert do not run parallel mode when you have only one file (#​146) (6613a97)

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