fix import path

archivebox/core/admin.py

@@ -11,7 +11,7 @@ from django.shortcuts import render, redirect
 from django.contrib.auth import get_user_model
 from django import forms
 
-from .util import htmldecode, urldecode, ansi_to_html
+from ..util import htmldecode, urldecode, ansi_to_html
 
 from core.models import Snapshot, Tag
 from core.forms import AddLinkForm, TagField