Github Login Change - Impossible login

Hello,

It seems that I am not the only one affected by this problem :

I recently changed my github username (from "meignanm" to "themaks"), and I can not log into my CheckIO account anymore.

Is it possible to change the Github login associated to my old account so I can log in ?

Thanks a lot,

Maxime

PS : I create this account in order to post that message, but you can delete it if necessary.