Properly check for loopback IP address.

lib/geocoder/lookups/maxmind.rb

@@ -9,7 +9,7 @@ module Geocoder::Lookup
 
     def results(query)
       # don't look up a loopback address, just return the stored result
-      return [reserved_result] if loopback_address?(query)
+      return [reserved_result] if query.loopback_ip_address?
       begin
         doc = fetch_data(query)
         if doc && doc.size == 10