Downgrade ipython to 5.5.0 version until we drop Python 2 support.
Downgrade ipython to 5.5.0 version until we drop Python 2 support.

sonofatailor/django-oscar,solarissmoke/django-oscar,sasha0/django-oscar,sasha0/django-oscar,solarissmoke/django-oscar,sasha0/django-oscar,solarissmoke/django-oscar,sonofatailor/django-oscar,sonofatailor/django-oscar,solarissmoke/django-oscar,django-oscar/django-oscar,django-oscar/django-oscar,django-oscar/django-oscar,django-oscar/django-oscar,sonofatailor/django-oscar,sasha0/django-oscar