Updated python depencies

backend/requirements.txt

 #OutGoing_REX
-Django==2.0.10
-psycopg2-binary==2.7.4
+Django==2.1.7
+psycopg2-binary==2.7.7
 django-cas-ng==3.6.0
-djangorestframework==3.8.2  # Django REST Framework
+djangorestframework==3.9.1
 coreapi==2.3.3  # Automatic API doc generation
-django-reversion==2.0.13
-django-reversion-compare==0.8.4
+django-reversion==3.0.3
+django-reversion-compare==0.8.6
 pytest-django==3.4.7
 pytest-cov==2.6.1
 pytest-xdist==1.23.0
-black
-flake8
-django-debug-toolbar==1.9.1
-pandas
-pyyaml
+django-debug-toolbar==1.11
+pandas==0.24.1
+pyyaml==3.13
 django-extensions==2.1.5
-uwsgi
-dotmap
+uwsgi==2.0.18
+dotmap==1.3.4
 django-webpack-loader==0.6.0
-ipython  # For a better Django shell
+
+# Direct dev depencies
+ipython==7.3.0  # For a better Django shell
+black==18.9b0
+flake8==3.7.6