Add Michael Ploujnikov to THANKS.

THANKS

@@ -162,6 +162,7 @@ Matthieu Lochegnies <prof at tocard dot org> - MPEG audio emphasis fix
 Max Rudberg <max_08 at mac.com> - Mac OS X controller art (v0.7.0)
 Meelad Zakaria <meelad at farsiweb dot info> - Persian localisation
 Michael Mondragon <mammon at lokmail.net> - ncurses compilation fix
+Michael Ploujnikov <ploujj at gmail dot com> - Spelling fix
 Michał Trzebiatowski <hippie_1968 at hotmail dot com> - Polish translation
 Mickael Hoerdt <hoerdt at clarinet.u-strasbg.fr> - IPv6 SSM multicast patch
 Miguel Angel Cabrera <macabrera at solaiemes.com> - RTMP access patch