add django as a dependency

setup.py

@@ -1,7 +1,6 @@
 import os
 from distutils.command.build import build
 
-from django.core import management
 from setuptools import find_packages, setup
 
 from pretix_poos import __version__
@@ -25,7 +24,7 @@ setup(
     author="n0emis",
     author_email="git@n0emis.eu",
     license="Apache",
-    install_requires=[],
+    install_requires=["django"],
     packages=find_packages(exclude=["tests", "tests.*"]),
     include_package_data=True,
     entry_points="""