Adding import statement to README
Adding import statement to README

Fixes #13
linux2400/django-recurrence,FrankSalad/django-recurrence,Nikola-K/django-recurrence,django-recurrence/django-recurrence,linux2400/django-recurrence,django-recurrence/django-recurrence,FrankSalad/django-recurrence,Nikola-K/django-recurrence