Syntax: %bSET <channel> URL <url|->%b

Sets the channel url to <url>.  When users perform an
%bINFO%b on the channel, they will be informed of the
channel's url. To clear the url use a "-" as the
parameter.
Alias: %bWEBSITE%b
Examples:
         %b/msg %C SET <channel> URL http://channel.com!%b
           Sets the url to "http://channel.com" on
           <channel>

         %b/msg %C SET <channel> URL -%b
           Clears the url on <channel>
