[Snyk] Security upgrade socket.io-client from 1.7.4 to 2.2.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	768/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.5	Denial of Service (DoS) SNYK-JS-SOCKETIOPARSER-1056752	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: socket.io-client

The new version differs by 53 commits.

• 3020e45 [chore] Release 2.2.0
• 06e9a4c [chore] Bump dependencies
• 4a93871 [chore] Update the Makefile
• eeafa44 [fix] Remove any reference to the `global` variable
• dfc34e4 [chore] Pin zuul version
• 2258c03 [chore] Update issue template
• 8372591 [chore] Release 2.1.1
• 23000b7 [docs] Add a link to the npm package in the README (#1195)
• 0fe9439 [fix] Fire an error event on middleware failure for non-root namespace (#1202)
• 3eb047f [chore] Release 2.1.0
• afb952d [docs] Add a note about reconnecting after a server-side disconnection
• 74893d5 [feat] Add a 'binary' flag (#1194)
• 9701611 [chore] Bump engine.io-client to version 3.2.0 (#1192)
• 3d8f24e [test] Update travis configuration
• e27f38b [chore] Restore unminified distribution files (#1191)
• bb743c4 [docs] Document connected and disconnected socket properties (#1155)
• f31837f [chore] Bump debug to version 3.1.0
• ebb0596 [chore] Release 2.0.4
• 57cee21 [test] Remove IE6 and IE7 tests (#1164)
• c58ecfc [docs] Add code examples for registered events (#1139)
• e9ebe36 [docs] Add an example with ES6 import in the README (#1138)
• 19f2b19 [chore] Release 2.0.3
• 83fedf5 [docs] Add explicit documentation for websocket transport (#1128)
• c0da119 [docs] Update documentation (#1124)

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