README: check the correct branch
README: check the correct branch

Spotted by Jacek Wielemborek

django-admin-bootstrapped/django-admin-bootstrapped,IMAmuseum/django-admin-bootstrapped,django-admin-bootstrapped/django-admin-bootstrapped,IMAmuseum/django-admin-bootstrapped,kevingu1003/django-admin-bootstrapped,kevingu1003/django-admin-bootstrapped,pombredanne/django-admin-bootstrapped,pombredanne/django-admin-bootstrapped,kevingu1003/django-admin-bootstrapped,django-admin-bootstrapped/django-admin-bootstrapped,pombredanne/django-admin-bootstrapped,IMAmuseum/django-admin-bootstrapped