Update dependency webpack-dev-server to v3.10.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
webpack-dev-server	devDependencies	patch	3.10.2 -> 3.10.3

---

Release Notes

webpack/webpack-dev-server

### [`v3.10.3`](https://togithub.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md#​3103httpsgithubcomwebpackwebpack-dev-servercomparev3102v3103-2020-02-05) [Compare Source](https://togithub.com/webpack/webpack-dev-server/compare/v3.10.2...v3.10.3)

---

Renovate configuration

:date: Schedule: At any time (no schedule defined).

:vertical_traffic_light: Automerge: Disabled by config. Please merge this manually once you are satisfied.

:recycle: Rebasing: Whenever PR becomes conflicted, or if you tick the rebase/retry checkbox below.

:no_bell: Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by WhiteSource Renovate. View repository job log here.