add removal of start/end brackets around IPv6 addresses #89
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Many proxies (e.g., IIS) add start/end brackets around IPv6 addresses in the X-Forwarded-For header, which prevents request-ip from being able to see them there since that fails the is.ip IPv6 regex test; this removes them if they're there.
This uses functions that have been in Javascript since time immemorial (string.startsWith, string.endsWith, string.substring), and all tests continue to pass.