Fixed install doc
Fixed install doc

ZuluPro/django-dbbackup,mjs7231/django-dbbackup,django-dbbackup/django-dbbackup,mjs7231/django-dbbackup,django-dbbackup/django-dbbackup,ZuluPro/django-dbbackup,Ubiwhere/django-dbbackup,Ubiwhere/django-dbbackup