Update dependency copy-webpack-plugin to v5

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
copy-webpack-plugin	devDependencies	major	4.6.0 -> 5.0.0	source

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Release Notes

webpack-contrib/copy-webpack-plugin

### [`v5.0.0`](https://togithub.com/webpack-contrib/copy-webpack-plugin/blob/master/CHANGELOG.md#​500httpsgithubcomwebpack-contribcopy-webpack-plugincomparev460v500-2019-02-20) [Compare Source](https://togithub.com/webpack-contrib/copy-webpack-plugin/compare/v4.6.0...v5.0.0) ##### Bug Fixes - copy only modified files when you use patterns with difference `to` and same `context` ([#​341](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/341)) ([e808aa2](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/e808aa2)) - handle `[contenthash]` as template ([#​328](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/328)) ([61dfe52](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/61dfe52)) - handles when you add new files in watch mode and use `glob` ([#​333](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/333)) ([49a28f0](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/49a28f0)) - normalize path segment separation, no problems when you mixed `/` and `\\` ([#​339](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/339)) ([8f5e638](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/8f5e638)) - throw error if `from` is an empty string [#​278](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/278) ([#​285](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/285)) ([adf1046](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/adf1046)) ##### Features - emit warning instead error if file doesn't exist ([#​338](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/338)) ([a1c5372](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/a1c5372)) - supports copy nested directories/files in symlink ([#​335](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/335)) ([f551c0d](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/f551c0d)) ##### BREAKING CHANGES - drop support for webpack < 4 - drop support for node < 6.9 - `debug` option was renamed to `logLevel`, it only accepts string values: `trace`, `debug`, `info`, `warn`, `error` and `silent` - plugin emit warning instead error if file doesn't exist - change `prototype` of plugin, now you can to get correct plugin name

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