Github Login Change - Impossible login

Hi,

First of all thanks for this great resource. This is probably my fault but I use checkio with my github account and I recently changed my username. When I logged back into checkio I'd lost all of my progress. I probably should've thought about this beforehand but just to let you know, if you don't already, that this is happening on the website.

my old account was "moony" and my github account is "https://gist.github.com/Aix-Shiao/"