You should absolutely change your password for this website, simply for the sake of safety and being sure. The simple fact is that the database was stolen, and you shouldn't trust a hacker's inability to get any useful out of the salted database any more than you should trust the hacker's inability to steal the database to begin with. Change your password, and if you have any websites that use your email as the login ID with the same password as roll20, change that password too. Nolan may be right, maybe this action won't be needed - but don't trust a hacker, or the groups that the hacker is usually selling those databases to, not to get around a security feature. It's what they do.