Correctly handles attrs['readonly'] = True

[JP-Ellis]

Thanks to https://gist.github.com/czpython/7683425 for posting the fix.

This closes #136.

[codingjoe]

Hi @JP-Ellis,

feels weird to hardcode this option. At a first glance it seems to be an issue with the type casting. True might be render True not true.
https://github.com/applegrew/django-select2/blob/python3/django_select2/util.py#L127-L151

Could you check this?

Cheers,
joe

[JP-Ellis]

I'm sorry, but I don't quite understand where you're coming from. How are those lines you highlighted relevant?

I'm not longer using this Django app as I have found another one to fit my needs better. I have left this pull request open in case it was of interest to anyone. If you wish, I can give you write access to my fork so you can do whatever changes you want and then pull it.

[codingjoe]

Haha, I'm coming from Berlin, and thanks, I don't need access to your remote repo. But thanks.

I don't feel comfortable merging the PR, it isn't solving the error cause rather patching one symptom. Therefore I will close the PR but the bug report is much appreciated and noted in #146