fix initadmin script

.travis.yml

@@ -9,11 +9,9 @@ before_install:
     - docker run -it -d -e POSTGRES_DB=onlinejudge -e POSTGRES_USER=onlinejudge -e POSTGRES_PASSWORD=onlinejudge -p 127.0.0.1:5433:5432 postgres:10
 install:
     - pip install -r deploy/requirements.txt
-    - mkdir log test_case upload
     - cp oj/custom_settings.example.py oj/custom_settings.py
     - echo "SECRET_KEY=\"`cat /dev/urandom | head -1 | md5sum | head -c 32`\"" >> oj/custom_settings.py
     - python manage.py migrate
-    - python manage.py initadmin
 script:
     - docker ps -a
     - flake8 .