Update dependency terser-webpack-plugin to v2

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
terser-webpack-plugin	devDependencies	major	^2.1.2	source

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Release Notes

webpack-contrib/terser-webpack-plugin

v2.1.2

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v2.1.1

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v2.1.0

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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)

v2.0.1

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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)

v2.0.0

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⚠ BREAKING CHANGES

• minimum require Node.js version is 8.9.0
• the extractComments option is true by default
• the cache option is true by default
• the parallel option is true by default
• using the extractComments.condition option with true value extract only some comments
• the sourceMap option now defaults to depending on the devtool Webpack option

Bug Fixes

• do not run parallel mode when you have only one file (#​134) (8b88b39)
• make extractComments API more consistent (#​129) (37d2df0)
• parallel on wsl (#​138) (0537591)

Features

• enable the cache option by default (#​132) (960d249)
• enable the extractComments option by default (ad2471c)
• enable the parallel option by default (#​131) (7b342af)
• respect devtool values for source map generation (#​140) (dd37ca1)

1.4.1 (2019-07-31)

Bug Fixes

• removed unnecessary dependency (#​111) (bc19b72)

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