Update dependency copy-webpack-plugin to v5.0.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
copy-webpack-plugin	dependencies	patch	5.0.3 -> 5.0.4

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Release Notes

webpack-contrib/copy-webpack-plugin

### [`v5.0.4`](https://togithub.com/webpack-contrib/copy-webpack-plugin/blob/master/CHANGELOG.md#​504httpsgithubcomwebpack-contribcopy-webpack-plugincomparev503v504-2019-07-26) [Compare Source](https://togithub.com/webpack-contrib/copy-webpack-plugin/compare/v5.0.3...v5.0.4)

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