private function findOrCreateUser($githubUser)
{
if ($authUser = User::where('github_id', $githubUser->id)->first()) {
return $authUser;
}
return User::create(['name' => $githubUser->name, 'email' => $githubUser->email, 'github_id' => $githubUser->id, 'avatar' => $githubUser->avatar]);
}