Attribution for LuaLaTeX.

UseLATEX.tex

@@ -1020,6 +1020,7 @@ something like my-image.pdf.
   Thanks to all of the following contributors.
 
   \begin{description}
+  \item[Matthias Bach] Instructions for using \lualatex.
   \item[Martin Baute] Check for Windows version of convert being used
     instead of ImageMagick's version.
   \item[Arnout Boelens] Example of using gri in conjunction with \latex.