eu flag (basque language flag)

Hello,

I’m using this great multilanguage plug in and I use the basque language in my website.
I made a eu.png flag but every time Polylang is updated the flag disapear.
Can you add this flag in the futur version of Polylang ?
Thnk you very much.
Kristian

http://ww.wp.xz.cn/plugins/polylang/