README and zlib

[Florian Weimer]

The README file seems to refer to an old location of zlib.  The
current one seems to be:

        http://www.gzip.org/zlib/

-- 
Florian Weimer 	                  Florian.Weimer at RUS.Uni-Stuttgart.DE
University of Stuttgart           http://cert.uni-stuttgart.de/
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