Bump engine.io to 2.0.2 to fix vulnerability in websocket

[nahammervold]

Bump engine.io to 2.0.2 to fix vulnerability in websocket

You want to:

• report a bug
• request a feature

Current behaviour

snyk test results in vulnerability

Steps to reproduce (if the current behaviour is a bug)

snyk test

Expected behaviour

no vulnerabilities

Setup

• OS:
• browser:
• socket.io version:

Other information (e.g. stacktraces, related issues, suggestions how to fix)

socketio/engine.io#478

[darrachequesne]

Closed by #2864.