Update ws to the latest version 🚀

[greenkeeper]

Version 3.0.0 of ws just got published.

Dependency	ws
Current Version	2.3.1
Type	dependency

The version 3.0.0 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 ws.
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.

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Release Notes

3.0.0

Breaking changes

• Removed the upgradeReq property (#1099).
• Removed unnecessary events (#1100).
• Removed the flags argument from the 'message', 'ping', and 'pong'
  events (#1101).
• The permessage-deflate extension is now disabled by default on the server
  (#1107).

Commits

The new version differs by 15 commits.

• 38df5a3 [dist] 3.0.0
• e6f6eb1 [doc] Add missing argument types
• fe44ff8 [major] Have permessage-deflate disabled by default (#1107)
• 439dbce [major] Prefix all private properties (#1105)
• d2c8481 [major] Remove the upgradeReq property (#1104)
• c15118f [major] Remove the flags argument (#1101)
• 68f12aa [major] Remove unnecessary events (#1100)
• 839eac8 chore(package): update mocha to version 3.4.1 (#1108)
• 1849ac2 [test] Skip test if 127.0.0.2 unavailable (#1106)
• abd27fe [doc] Tweak markdown formatting
• 9d0efbb [doc] Fix typo in code snippet
• 2e92c74 [doc] Add FAQ and TOC
• cce4d0f [test] Add callback to wss.close()
• d75ab9d chore(package): update nyc to version 10.3.0 (#1091)
• 6ade76d chore(package): update mocha to version 3.3.0 (#1086)

See the full diff

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