Don't rescue from StandardError.

This code appears to be copied from the Freegeoip lookup, where it is
undesirable to begin with.

lib/geocoder/lookups/maxmind.rb

@@ -18,9 +18,6 @@ module Geocoder::Lookup
           warn "Maxmind error : #{doc[10]}" if doc
           return []
         end
-      rescue StandardError => err
-        raise_error(err)
-        return []
       end
     end