2014-02-09: link to git2html.

link to git2html.

diff --git a/README.txt b/README.txt
--- a/README.txt
+++ b/README.txt
@@ -112,4 +112,6 @@ Notes
 
 Copyright 2012 till 2014 Arne Babenhauserheide, Licensed under GPLv2 or later.
 
-Related: git2html → http://hssl.cs.jhu.edu/~neal/git2html/
+Related: [git2html][] 
+
+[git2html]: http://hssl.cs.jhu.edu/~neal/git2html/ "A static repository generator for git"