title: django_neomodel can't find attribute MAX_POOL_SIZE
body: <p>I am trying to set my first Django project using neo4j as database and neomodel as OGM, so I am following <a href="https://pypi.org/project/django_neomodel/" rel="nofollow noreferrer">this directions</a>. Nevertheless, when a try to start Django server, I get this error:</p>
  <pre><code>Exception in thread django-main-thread:
  Traceback (most recent call last):
    File &quot;/usr/local/Cellar/python@3.8/3.8.6_2/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py&quot;, line 932, in _bootstrap_inner
      self.run()
    File &quot;/usr/local/Cellar/python@3.8/3.8.6_2/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py&quot;, line 870, in run
      self._target(*self._args, **self._kwargs)
    File &quot;/Users/hugovillalobos/Documents/Code/attractoraproject/attractora_backend/AttractoraVenv/lib/python3.8/site-packages/django/utils/autoreload.py&quot;, line 53, in wrapper
      fn(*args, **kwargs)
    File &quot;/Users/hugovillalobos/Documents/Code/attractoraproject/attractora_backend/AttractoraVenv/lib/python3.8/site-packages/django/core/management/commands/runserver.py&quot;, line 110, in inner_run
      autoreload.raise_last_exception()
    File &quot;/Users/hugovillalobos/Documents/Code/attractoraproject/attractora_backend/AttractoraVenv/lib/python3.8/site-packages/django/utils/autoreload.py&quot;, line 76, in raise_last_exception
      raise _exception[1]
    File &quot;/Users/hugovillalobos/Documents/Code/attractoraproject/attractora_backend/AttractoraVenv/lib/python3.8/site-packages/django/core/management/__init__.py&quot;, line 357, in execute
      autoreload.check_errors(django.setup)()
    File &quot;/Users/hugovillalobos/Documents/Code/attractoraproject/attractora_backend/AttractoraVenv/lib/python3.8/site-packages/django/utils/autoreload.py&quot;, line 53, in wrapper
      fn(*args, **kwargs)
    File &quot;/Users/hugovillalobos/Documents/Code/attractoraproject/attractora_backend/AttractoraVenv/lib/python3.8/site-packages/django/__init__.py&quot;, line 24, in setup
      apps.populate(settings.INSTALLED_APPS)
    File &quot;/Users/hugovillalobos/Documents/Code/attractoraproject/attractora_backend/AttractoraVenv/lib/python3.8/site-packages/django/apps/registry.py&quot;, line 122, in populate
      app_config.ready()
    File &quot;/Users/hugovillalobos/Documents/Code/attractoraproject/attractora_backend/AttractoraVenv/lib/python3.8/site-packages/django_neomodel/apps.py&quot;, line 20, in ready
      self.read_settings()
    File &quot;/Users/hugovillalobos/Documents/Code/attractoraproject/attractora_backend/AttractoraVenv/lib/python3.8/site-packages/django_neomodel/apps.py&quot;, line 17, in read_settings
      config.MAX_POOL_SIZE = getattr(settings, 'NEOMODEL_MAX_POOL_SIZE', config.MAX_POOL_SIZE)
  AttributeError: module 'neomodel.config' has no attribute 'MAX_POOL_SIZE'
  </code></pre>
  <p>I am using python 3.7 and Django 3.1.4.</p>
  <p><strong>EDIT</strong>
  These are my settings, as directions state, and I have no code yet, I just want to start Django server with this settings.</p>
  <pre><code>NEOMODEL_NEO4J_BOLT_URL = os.environ.get('NEO4J_BOLT_URL', 'bolt://neo4j:test@localhost:7687')
  
  INSTALLED_APPS = [
      'django.contrib.admin',
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.messages',
      'django.contrib.staticfiles',
      'django_neomodel',
      'rest_framework',
  ]
  </code></pre>