public function handle($request)
 {
     $member = Member::register($request->name, $request->email, $request->githubUrl, $request->githubId, $request->imageUrl);
     $this->memberRepository->save($member);
     $this->dispatcher->dispatch($member->releaseEvents());
     return new RegisterMemberResponse($member);
 }
 private function getUser($username)
 {
     return Member::where('name', '=', $username)->where('is_banned', '=', 0)->first();
 }