fixing RemovedInDjango19Warning

Author: gfairchild

nested_inline/admin.py

@@ -8,7 +8,7 @@
 from django.utils.encoding import force_text
 from django.views.decorators.csrf import csrf_protect
 from django.utils.translation import ugettext as _
-from django.contrib.admin.util import unquote
+from django.contrib.admin.utils import unquote
 from django.db import transaction, models
 from django.utils.html import escape
 from django.conf import settings