Fix setup.py (yes, another commit) to read from requirements.txt

setup.py

 import os
 from setuptools import setup, find_packages
+from pip.req.req_file import parse_requirements
+from pip.download import PipSession
 
 README = open(os.path.join(os.path.dirname(__file__), "README.md")).read()
 
@@ -7,6 +9,12 @@ README = open(os.path.join(os.path.dirname(__file__), "README.md")).read()
 os.chdir(os.path.normpath(os.path.join(os.path.abspath(__file__), os.pardir)))
 
 
+def get_requirements_list():
+    filename = os.path.join(os.path.dirname(__file__), "requirements.txt")
+    objects = list(parse_requirements(filename, session=PipSession()))
+    strings = [str(o.req) for o in objects]
+    return strings
+
 
 setup(
     name='django-ssoauth',
@@ -20,10 +28,7 @@ setup(
     author='Art Lukyanchyk',
     author_email='artiom.lukyanchyk@hs-hannover.de',
     zip_safe=False,
-    install_requires=[
-        'python3-saml',
-        'Django>=1.11,<2.0'
-    ],
+    install_requires=get_requirements_list(),
     classifiers=[
         'Environment :: Web Environment',
         'Framework :: Django',