Loopback uppercase address not detected

[M393]

This regex was case-sensitive and only matched lowercase ffff.
In other places matching is already case-insensitive.

node-ip/lib/ip.js

Lines 325 to 329 in 3b0994a

	return /^(::f{4}:)?10\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr)
	|| /^(::f{4}:)?192\.168\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr)
	|| /^(::f{4}:)?172\.(1[6-9]|2\d|30|31)\.([0-9]{1,3})\.([0-9]{1,3})$/i
	.test(addr)
	|| /^(::f{4}:)?169\.254\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr)

[ouuan]

Unfortunately, this is still far from complete. See #143