fix: parse port in x-forwarded-for (#827)

[jasonmacgowan]

Parses out IPs even if a port is sent in x-forwarded-for for IPv4. Probably fails if port is sent with an IPv6 address, but works otherwise.

fixes #827

[codecov[bot]]

Codecov Report

Merging #1205 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1205   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          487       494    +7     
  Branches       136       135    -1     
=========================================
+ Hits           487       494    +7     

Impacted Files	Coverage Δ
lib/request.js	100.00% <100.00%> (ø)

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[jasonmacgowan]

Looks like @3imed-jaberi is going to be unavailable for a while based on his profile.

Anyone else around to take a look at this?

/cc @jonathanong @dougwilson