[Snyk] Upgrade socket.io from 2.1.1 to 2.3.0

[snyk-bot]

Snyk has created this PR to upgrade socket.io from 2.1.1 to 2.3.0.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 2 versions ahead of your current version.
• The recommended version was released 6 months ago, on 2019-09-20.

Release notes

Package name: socket.io

• 2.3.0 - 2019-09-20
  

  Diff: 2.2.0...2.3.0

• 2.2.0 - 2018-11-28
  

  Features

  • add cache-control header when serving the client source (#2907)

  Bug fixes

  • throw an error when trying to access the clients of a dynamic namespace (#3355)

  Milestone: 2.2.0
  Diff: 2.1.1...2.2.0
  Client release: 2.2.0
  Diff engine.io: socketio/engine.io@3.2.0...3.3.1
  Diff ws: https://github.com/websockets/ws/compare/3.3.1..6.1.2

• 2.1.1 - 2018-05-17
  

  Features

  (server) add local flag to the socket object (#3219)

  socket.local.to('room101').emit(/* */);

  Bug fixes

  (client) fire an error event on middleware failure for non-root namespace (socketio/socket.io-client#1202)

  Milestone: 2.1.1
  Diff: 2.1.0...2.1.1 (client diff)

from socket.io GitHub release notes

Commit messages

Package name: socket.io

• 47161a6 [chore] Release 2.3.0
• cf39362 [chore] Bump socket.io-parser to version 3.4.0
• 4d01b2c test: remove deprecated Buffer usage (#3481)
• 8227192 [docs] Fix the default value of the 'origins' parameter (#3464)
• 1150eb5 [chore] Bump engine.io to version 3.4.0
• 9c1e73c [chore] Update the license of the chat example (#3410)
• df05b73 [chore] Release 2.2.0
• b00ae50 [feat] Add cache-control header when serving the client source (#2907)
• d3c653d [docs] Add Touch Support to the whiteboard example (#3104)
• a7fbd1a [fix] Throw an error when trying to access the clients of a dynamic namespace (#3355)
• 190d22b [chore] Bump dependencies
• 7b8fba7 [test] Update Travis configuration
• e5f0cea [docs] Use new JavaScript syntax inside the README (#3360)
• 7e35f90 [docs] fix `this` scope in the chat example
• 2dbec77 [chore] Update issue template
• d97d873 [docs] update README.md (#3309)

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