fix(deps): update dependency terser-webpack-plugin to v2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
terser-webpack-plugin	dependencies	major	1.4.1 -> 2.0.1

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Release Notes

webpack-contrib/terser-webpack-plugin

### [`v2.0.1`](https://togithub.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md#​201httpsgithubcomwebpack-contribterser-webpack-plugincomparev200v201-2019-09-06) [Compare Source](https://togithub.com/webpack-contrib/terser-webpack-plugin/compare/v2.0.0...v2.0.1) ### [`v2.0.0`](https://togithub.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md#​200httpsgithubcomwebpack-contribterser-webpack-plugincomparev141v200-2019-09-05) [Compare Source](https://togithub.com/webpack-contrib/terser-webpack-plugin/compare/v1.4.1...v2.0.0) ##### ⚠ 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 ##### Bug Fixes - do not run parallel mode when you have only one file ([#​134](https://togithub.com/webpack-contrib/terser-webpack-plugin/issues/134)) ([8b88b39](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/8b88b39)) - make `extractComments` API more consistent ([#​129](https://togithub.com/webpack-contrib/terser-webpack-plugin/issues/129)) ([37d2df0](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/37d2df0)) - parallel on wsl ([#​138](https://togithub.com/webpack-contrib/terser-webpack-plugin/issues/138)) ([0537591](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/0537591)) ##### Features - enable the cache option by default ([#​132](https://togithub.com/webpack-contrib/terser-webpack-plugin/issues/132)) ([960d249](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/960d249)) - enable the extractComments option by default ([ad2471c](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/ad2471c)) - enable the parallel option by default ([#​131](https://togithub.com/webpack-contrib/terser-webpack-plugin/issues/131)) ([7b342af](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/7b342af)) - respect `devtool` values for source map generation ([#​140](https://togithub.com/webpack-contrib/terser-webpack-plugin/issues/140)) ([dd37ca1](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/dd37ca1)) ##### [1.4.1](https://togithub.com/webpack-contrib/terser-webpack-plugin/compare/v1.4.0...v1.4.1) (2019-07-31) ##### Bug Fixes - removed unnecessary dependency ([#​111](https://togithub.com/webpack-contrib/terser-webpack-plugin/issues/111)) ([bc19b72](https://togithub.com/webpack-contrib/terser-webpack-plugin/commit/bc19b72))

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