Bump socket.io from 1.7.3 to 2.2.0

[dependabot-preview]

Bumps socket.io from 1.7.3 to 2.2.0.

Release notes

Sourced from socket.io's releases.

2.2.0

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

Features

(server) add local flag to the socket object (https://github-redirect.dependabot.com/socketio/socket.io/pull/3219)

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

Bug fixes

(client) fire an error event on middleware failure for non-root namespace (https://github-redirect.dependabot.com/socketio/socket.io-client/pull/1202)

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

2.1.0

Features

• add a 'binary' flag (#3185)

// by default, the object is recursively scanned to check whether it contains some binary data
// in the following example, the check is skipped in order to improve performance
socket.binary(false).emit('plain-object', object);

// it also works at the namespace level
io.binary(false).emit('plain-object', object);

• add support for dynamic namespaces (#3195)

io.of(/^\/dynamic-\d+$/).on('connect', (socket) => {
</tr></table> ... (truncated)

Commits

• 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...
• 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)
• Additional commits viewable in compare view

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