Update maintainer list

[skip ci]

libs/maintainers.txt

@@ -106,6 +106,7 @@ optional              Fernando Cacciola <fernando_cacciola -at- ciudad.com.ar>,
 outcome               Niall Douglas
 parameter             David Abrahams <dave -at- boost-consulting.com>, Daniel Wallin <daniel -at- boostpro.com>
 parameter_python      David Abrahams <dave -at- boost-consulting.com>, Daniel Wallin <daniel -at- boostpro.com>
+pfr                   Antony Polukhin <antoshkka -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>
 poly_collection       Joaquin M Lopez Munoz <joaquin.lopezmunoz -at- gmail.com>
 polygon               Lucanus Simonson <lucanus.j.simonson -at- intel.com>, Andrii Sydorchuk <sydorchuk.andriy -at- gmail.com>