Update maintainer list.

libs/maintainers.txt

@@ -11,7 +11,7 @@
 
 accumulators          Eric Niebler <eric -at- boostpro.com>
 algorithm             Marshall Clow <marshall -at- idio.com>
-algorithm/minmax      Herve Bronnimann <hbr -at- poly.edu>
+algorithm/minmax      Marshall Clow <marshall -at- idio.com>
 algorithm/string      Marshall Clow <marshall -at- idio.com>
 align                 Glen Fernandes <glenjofe -at- gmail.com>
 any                   Antony Polukhin <antoshkka -at- gmail.com>
@@ -82,7 +82,7 @@ numeric/ublas         David Bellot <david.bellot -at- gmail.com>
 operators             Daniel Frey <d.frey -at- gmx.de>
 optional              Fernando Cacciola <fernando_cacciola -at- ciudad.com.ar>, Andrzej Krzemienski <akrzemi1 -at- gmail.com>
 parameter             David Abrahams <dave -at- boost-consulting.com>, Daniel Wallin <daniel -at- boostpro.com>
-phoenix               Joel de Guzman <joel -at- boost-consulting.com>, Thomas Heller <thom.heller -at- gmail.com>
+phoenix               Joel de Guzman <djowel -at- gmail.com>, Thomas Heller <thom.heller -at- gmail.com>, John Fletcher <J.P.Fletcher -at- aston.ac.uk>
 polygon               Lucanus Simonson <lucanus.j.simonson -at- intel.com>, Andrii Sydorchuk <sydorchuk.andriy -at- gmail.com>
 pool                  Stephen Cleary <scleary -at- jerviswebb.com>
 predef                Rene Rivera <grafikrobot -at- gmail.com>