replaced old link in README.

Author: ruthhoffmann

README.md

@@ -76,7 +76,7 @@ Loading  PatternClass 2.4.1 (A permutation pattern class package)
 by Ruth Hoffmann (https://rh347.host.cs.st-andrews.ac.uk/),
    Steve Linton (http://sal.host.cs.st-andrews.ac.uk/), and
    Michael Albert (http://www.cs.otago.ac.nz/staff/michael.html).
-Homepage: https://RuthHoffmann.github.io/PatternClass/
+Homepage: https://gap-packages.github.io/PatternClass/
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