Allow passing in attrs to the widget

[cool-RR]

This method:

https://github.com/praekelt/django-simple-autocomplete/blob/master/simple_autocomplete/widgets.py#L98

Takes attrs, but it doesn't do anything with them. I'm trying to put a required="required" attribute on the input, but it's not working because this method ignores it. It should put those attrs into the HTML in generates.

[hedleyroos]

You're right. It does get passed through when falling back to the default view, but never gets used in the autocomplete widget itself.