Update ws to the latest version 🚀

[greenkeeper]

Version 6.0.0 of ws was just published.

Dependency	ws
Current Version	5.2.2
Type	dependency

The version 6.0.0 is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

It might be worth looking into these changes and trying to get this project onto the latest version of ws.

If you have a solid test suite and good coverage, a passing build is a strong indicator that you can take advantage of these changes directly by merging the proposed change into your project. If the build fails or you don’t have such unconditional trust in your tests, this branch is a great starting point for you to work on the update.

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Release Notes

6.0.0

Breaking changes

• Dropped support for Node.js 4 (d73885c).
• Added a shim that throws an error when used if the package is bundled for the
  browser (#1345).
• Added a maxPayload option on the client. Defaults to 100 MiB (#1402).
• Dropped support for the memLevel and level options. Use
  zlibDeflateOptions instead. (80e2002).

Commits

The new version differs by 15 commits ahead by 15, behind by 2.

• 1ee42fd [dist] 6.0.0
• d963003 [example] Update dependencies
• 38d2e8b chore(package): update eslint-plugin-node to version 7.0.0 (#1420)
• fc95793 [fix] Fix use after invalidation bug
• fbd4391 [fix] Fix compatibility with Node.js 6
• b354cd1 [minor] Remove no longer needed workaround for socketPath option
• ef5a8f5 [pkg] Update eslint-plugin-standard to version 3.1.0
• 80e2002 [major] Drop support for the memLevel and level options
• 92d0a2e [major] Add maxPayload option for the client (#1402)
• 9f87842 [major] Make bundlers use a browser shim that throws an error (#1345)
• 72bfbe8 chore(package): update bufferutil to version 4.0.0 (#1413)
• 5bb29ed chore(package): update utf-8-validate to version 5.0.0 (#1415)
• 3bc6b96 chore(package): update eslint to version 5.0.0 (#1403)
• d73885c [major] Drop support for Node.js 4
• 5d90141 chore(package): update eslint-plugin-import to version 2.13.0 (#1405)

See the full diff

FAQ and help

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Your Greenkeeper bot 🌴

[codecov]

Codecov Report

Merging #4909 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4909   +/-   ##
=======================================
  Coverage   92.92%   92.92%           
=======================================
  Files         119      119           
  Lines        8836     8836           
=======================================
  Hits         8211     8211           
  Misses        625      625

Impacted Files	Coverage Δ
src/RestWrite.js	93.32% <0%> (ø)	⬆️

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