[Twisted-web] bug in README

[Matt Goodall]

Jeff Bauer wrote:
> In current README:
> 
> < svn co svn://divmod.org/svn/Nevow/trunk Nevow
>> svn co http://divmod.org/svn/Divmod/trunk/Nevow Nevow
> 
> Is there a better way to report bugs?  The divmod trac
> is restricted.

I've fixed the svn URL, thanks.

The link to the Twisted site was pointing to an old downloads (1.3) page
so I changed that too.

- Matt