Fix missing importlib import and bump version number

Author: Mark Gibbs

django_plotly_dash/__init__.py

@@ -26,6 +26,6 @@
 SOFTWARE.
 '''
 
-__version__ = "0.9.1"
+__version__ = "0.9.2"
 
 from .dash_wrapper import DjangoDash

django_plotly_dash/access.py

@@ -22,6 +22,7 @@
 SOFTWARE.
 '''
 
+import importlib
 from django.conf import settings
 
 from django.contrib.auth.decorators import login_required as login_required_decorator