Upgrade django-model-utils to 2.3.1

local_requirements.txt

 # Django/Framework Packages
 django>=1.4.12,<=1.4.22
-django-model-utils==1.4.0
+django-model-utils==2.3.1
 South>=0.7.6
 djangorestframework>=2.3.5,<=2.3.14
+django-ipware==1.1.0
 pytz>=2012h
 pycrypto>=2.6

requirements.txt

-
-
-# Third Party
--e git+https://github.com/un33k/django-ipware.git@42cb1bb1dc680a60c6452e8bb2b843c2a0382c90#egg=django-ipware
+# Empty so that we will use the versions of dependencies installed in edx-platform.
+# See local_requirements.txt for the requirements needed for local development.

setup.py

@@ -34,7 +34,7 @@ def load_requirements(*requirements_paths):
 
 setup(
     name='edx-proctoring',
-    version='0.6.2',
+    version='0.6.3',
     description='Proctoring subsystem for Open edX',
     long_description=open('README.md').read(),
     author='edX',