Fix ref to non-existent __unicode__ function

Author: peterkuma

fileshack/admin.py

@@ -2,7 +2,7 @@
 from django.contrib import admin
 
 class StoreAdmin(admin.ModelAdmin):
-    list_display = ("__unicode__",)
+    list_display = ("__str__",)
 
 class ItemAdmin(admin.ModelAdmin):
     pass