Update requirements

requirements.txt

+certifi==2019.3.9
 Django==2.2
-django_auth_ldap==1.7.0
+django-auth-ldap==1.7.0
+django-formtools==2.1
+django-sslserver==0.20
 ldap3==2.6
+psycopg2-binary==2.8.2
+pyasn1==0.4.5
+pyasn1-modules==0.2.4
+python-dateutil==2.8.0
+python-ldap==3.2.0
+pytz==2019.1
+six==1.12.0
+sqlparse==0.3.0
 squareconnect==2.20190410.0
-django_formtools==2.2
-python_ldap==3.2.0
+urllib3==1.25