Use latest socket.io

[psy21d]

if use your version, need uws, that is deprecated and not in npm

i install latest socket io,
"socket.io": "^2.1.1",

and now all works good.
Please, check it.

[its-danny]

Also, github and npm complain about these with current version:

• https://nvd.nist.gov/vuln/detail/CVE-2016-10536
• https://nvd.nist.gov/vuln/detail/CVE-2017-16113