Add client_ip support
#19
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This PR retrieves the (actual) client IP from the HTTP request context.
Since caddyserver/caddy#5104 was merged, Caddy determines the actual client IP, instead of assuming it's always the same as the
r.RemoteAddrproperty. If a proxy sits in front of Caddy, it's now possible to configure Caddy so that the forwarded client IP header is set in the context. Some additional context can be found in kirsch33/realip#14.This PR closes #15.