fix: update ipaddr.js to 2.x and support /0 CIDR notation

[marceli1404]

Closes #65, Closes #28

#65 — Update ipaddr.js to 2.x

• Bump \ipaddr.js\ from \1.9.1\ to ^2.2.0\
• ipaddr.js 2.x is API-compatible for proxy-addr's usage (\parse, \isValid, \match\ with 2 args, \prefixLengthFromSubnetMask, \kind, \ oIPv4Address, \ oIPv4MappedAddress, \isIPv4MappedAddress)
• All 70 existing tests pass without modification

#28 — Support \

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​ipaddr.js@​1.9.1 ⏵ 2.4.0	+1		+1

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[krzysdz]

Please don't combine multiple unrelated changes in a single PR. This makes the commit history harder to analyse in the future.

Duplicate of #59 and #66