Templates: auditlog_tags in multiple modules

I've customized the auditlog templates in my project's templatetags as instructed,and now get the following warning in my project:

```
<django.template.backends.django.DjangoTemplates object at 0x7fbb84e1f770>: 
(templates.W003) 'auditlog_tags' is used for multiple template tag modules: 'app.templatetags.auditlog_tags', 'auditlog.templatetags.auditlog_tags'
```

Possibly linked to #767