fix version of urllib3 to avoid dependency problems
fix version of urllib3 to avoid dependency problems

OWASP/django-DefectDojo,rackerlabs/django-DefectDojo,OWASP/django-DefectDojo,OWASP/django-DefectDojo,rackerlabs/django-DefectDojo,OWASP/django-DefectDojo,OWASP/django-DefectDojo,rackerlabs/django-DefectDojo,rackerlabs/django-DefectDojo