2011-10-20: added reference to git2html

added reference to git2html

diff --git a/README.txt b/README.txt
--- a/README.txt
+++ b/README.txt
@@ -17,3 +17,5 @@ Install:
 Usage:
 
 * hg static --help
+
+Related: git2html → http://hssl.cs.jhu.edu/~neal/git2html/