nag complains about \centerline in environment “shaded” from package framed

Question

Running this with Miktex, pdflatex, Windows, TeXnicCenter, everything fully up to date:

\documentclass{article}

\usepackage[l2tabu]{nag}
\usepackage{xcolor}
\usepackage{framed}

\definecolor{shadecolor}{named}{lightgray}

\begin{document}

\begin{shaded}
  Foo Bar
\end{shaded}

\end{document}

gives:

Package nag Warning: Command \centerline is TeX. 
(nag)                Use \centering or center environment instead on input line 13.

Is there anything I can do about it without changing the package itself? Any better packages than framed available that can do the same (page breaking colored boxed)? If not, how to contact the author of the package and inform him?

Answer 1

Since nobody gave an answer, but only comments, I'll write the answer myself from the comments.

1. nag complain is wrong fussy
2. mdframed is more flexible than framed and doesn't produce this warning