Update dependency webpack-dev-server to v3.8.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
webpack-dev-server	devDependencies	patch	3.8.1 -> 3.8.2

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Release Notes

webpack/webpack-dev-server

### [`v3.8.2`](https://togithub.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md#​382httpsgithubcomwebpackwebpack-dev-servercomparev381v382-2019-10-02) [Compare Source](https://togithub.com/webpack/webpack-dev-server/compare/v3.8.1...v3.8.2)

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[tiftran]

bors r+

[bors[bot]]

:-1: Rejected by too few approved reviews

[tiftran]

bors r+

[bors[bot]]

Build succeeded

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