title: Shell saying that django_cleanup module I've installed don't exist
body: <p>Like in title I've installed django_cleanup by using:</p>
  
  <pre><code>pip install django-cleanup
  </code></pre>
  
  <p>and put in INSTALLED_APPS:</p>
  
  <pre><code>INSTALLED_APPS = [
  'django_cleanup',
  'django.contrib.admin',
  'django.contrib.auth',
  'django.contrib.contenttypes',
  'django.contrib.sessions',
  'django.contrib.messages',
  'django.contrib.staticfiles',
  'django.contrib.sites',
  'django.contrib.flatpages',
  'shop',
  'account',
  'rest_framework',
  ]
  </code></pre>
  
  <p>but now when I'm trying to run test or server in shell then i get: </p>
  
  <pre><code>ModuleNotFoundError: No module named 'django_cleanup'
  </code></pre>