Bumps [uglifyjs-webpack-plugin](https://github.com/webpack-contrib/uglifyjs-webpack-plugin) from 2.1.3 to 2.2.0. - [Release notes](https://github.com/webpack-contrib/uglifyjs-webpack-plugin/releases) - [Changelog](https://github.com/webpack-contrib/uglifyjs-webpack-plugin/blob/master/CHANGELOG.md) - [Commits](https://github.com/webpack-contrib/uglifyjs-webpack-plugin/compare/v2.1.3...v2.2.0) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>