[Snyk] Upgrade ws from 6.1.4 to 7.1.2

[snyk-bot]

Snyk has created this PR to upgrade ws from 6.1.4 to 7.1.2.

Warning: This is a major version upgrade, and may be a breaking change.

• The recommended version is 7 versions ahead of your current version.
• The recommended version was released 2 months ago, on 2019-08-12.

Release notes

• Package name: ws
  • 7.1.2 - 2019-08-12

    Bug fixes

    • Fixed a bug that caused compress jobs to never be marked as complete
      (#1618).
  • 7.1.1 - 2019-07-19

    Bug fixes

    • An error is now thrown if the WebSocket server constructor is used
      incorrectly (3641266).
  • 7.1.0 - 2019-07-08

    Features

    • Added utility to wrap a WebSocket in a Duplex stream (#1589).

    Bug fixes

    • Reverted "[minor] Remove unneeded if statement" (dbacf58, #1591).
  • 7.0.1 - 2019-06-17

    Bug fixes

    • Added ability to disable sending the SNI extension (#1587).
  • 7.0.0 - 2019-04-30

    Breaking changes

    • Dropped support for Node.js 6 (1e6999b).
    • Dropped support for url.Url instances in the WebSocket constructor
      (692d7b4).
    • The behavior of WebSocket#{p{i,o}ng,send}() has changed when the
      readyState attribute is not OPEN (#1532)
      • If the readyState attribute is CONNECTING, an exception is thrown.
      • If the readyState attribute is CLOSING or CLOSED
        • The bufferedAmount attribute is increased by the length of the data
          argument in bytes.
        • If provided, the callback function is called with an error.
        • No exception is thrown even if the callback function is not provided.
  • 6.2.1 - 2019-03-27

    Bug fixes

    • Fixed a bug that, under certain circumstances, prevented the close timer from
      being set (aa1dcd5).
  • 6.2.0 - 2019-03-06

    Features

    • Added ability to follow redirects (#1490).

    Bug fixes

    • The opening handshake is now aborted if the Sec-WebSocket-Key header field
      value is invalid (160af45).
  • 6.1.4 - 2019-02-16

    Bug fixes

    • Fixed an issue that caused the Host header to always include a port (#1510).
from [`ws` GitHub Release Notes](https://github.com/websockets/ws/releases)

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