git-mailrc: add alias for Eugen Hristev

add my patchwork alias

Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>

doc/git-mailrc

@@ -22,6 +22,7 @@ alias apritzel       Andre Przywara <andre.przywara@arm.com>
 alias bmeng          Bin Meng <bmeng.cn@gmail.com>
 alias danielschwierzeck Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
 alias dinh           Dinh Nguyen <dinguyen@kernel.org>
+alias ehristev       Eugen Hristev <eugen.hristev@collabora.com>
 alias hs             Heiko Schocher <hs@denx.de>
 alias freenix        Peng Fan <peng.fan@nxp.com>
 alias iwamatsu       Nobuhiro Iwamatsu <iwamatsu@nigauri.org>