Update dependency terser-webpack-plugin to v3.0.7

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
terser-webpack-plugin	devDependencies	patch	3.0.6 -> 3.0.7

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Release Notes

webpack-contrib/terser-webpack-plugin

### [`v3.0.7`](https://togithub.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md#​307-httpsgithubcomwebpack-contribterser-webpack-plugincomparev306v307-2020-07-16) [Compare Source](https://togithub.com/webpack-contrib/terser-webpack-plugin/compare/v3.0.6...v3.0.7)

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