Update maintainer list

[skip ci]

libs/maintainers.txt

@@ -137,7 +137,7 @@ statechart            Andreas Huber <ahd6974-boostorg -at- yahoo.com>
 static_assert         John Maddock <john -at- johnmaddock.co.uk>
 test                  Gennadiy Rozental <rogeeff -at- gmail.com>, Raffi Enficiaud <raffi.enficiaud -at- free.fr>
 thread                Vicente J. Botet Escriba <vicente.botet -at- wanadoo.fr>
-throw_exception       Emil Dotchevski <emil -at- revergestudios.com>
+throw_exception       Emil Dotchevski <emil -at- revergestudios.com>, Peter Dimov <pdimov -at- pdimov.com>
 timer                 Beman Dawes <bdawes -at- acm.org>
 tokenizer             John R. Bandela <jbandela -at- ufl.edu>
 tr1                   John Maddock <john -at- johnmaddock.co.uk>