chore(deps): update dependency webpack-dev-server to ^3.1.14

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
webpack-dev-server	devDependencies	patch	^3.1.13 -> ^3.1.14	source

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Release Notes

webpack/webpack-dev-server

### [`v3.1.14`](https://renovatebot.com/gh/webpack/webpack-dev-server/blob/master/CHANGELOG.md#​3114httpsgithubcomwebpackwebpack-dev-servercomparev3113v3114-2018-12-24) [Compare Source](https://renovatebot.com/gh/webpack/webpack-dev-server/compare/v3.1.13...v3.1.14) ##### Bug Fixes - add workaround for Origin header in sockjs ([#​1608](https://renovatebot.com/gh/webpack/webpack-dev-server/issues/1608)) ([1dfd4fb](https://renovatebot.com/gh/webpack/webpack-dev-server/commit/1dfd4fb))

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