Update webpack-dev-server to version 2.4.2 🚀

[greenkeeperio-bot]

Hello lovely humans,

webpack-dev-server just published its new version 2.4.2.

State	Update 🚀
Dependency	webpack-dev-server
New version	2.4.2
Type	devDependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of webpack-dev-server.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Do you have any ideas how I could improve these pull requests? Did I report anything you think isn’t right?
Are you unsure about how things are supposed to work?

There is a collection of frequently asked questions and while I’m just a bot, there is a group of people who are happy to teach me new things. Let them know.

Good luck with your project ✨

You rock!

🌴

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The new version differs by 255 commits (ahead by 255, behind by 34).

• 60e4727 2.4.2
• 32adae3 Added beforeunload check to index.js (#544) (#841)
• d69559a Handle external upgrade for all websocket proxies (#843)
• 35a44d1 Remove Node.js v7 warning
• d2f579c Support for array of contentBase (#832)
• aabeeaa Remove unnecessary logging of closing the dev-server
• 1dc9461 Fix to share proxy option between proxy settings when the proxy option is a same object (#836)
• 42cd23c Explicitely but gracefully handle SIGINT and SIGTERM signals. (#787)
• 85de417 Use arrow function if it possible and get rid of .bind in server part (#835)
• 234294a Add unit tests for proxy options (#834)
• 8d4b826 add codecov
• d081f01 Update webpack-dev-middleware to 0.17.4 (#827)
• ccc8163 Fix exception when client script is used in webworkers (#813)
• f996bd4 fix typo and add --open (#814)
• 690df60 devClient does not work with dynamic entry. (#802)

There are 250 commits in total. See the full diff.

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[coveralls]

Coverage increased (+0.3%) to 89.298% when pulling 2f97aa8 on greenkeeper-webpack-dev-server-2.4.2 into 020295b on master.

[instantlinux]

replaced by #447