Button no longer disabled on submit

[Lyalpha]

After recently upgrading from 1.5.0 to 3.0.5, I think I've seen a regression of the issue fixed in #58 - to disable the submit button. As submitBtn is no longer a modalForm option, at least not documented, then:

django-bootstrap-modal-forms/bootstrap_modal_forms/static/js/jquery.bootstrap.modal.forms.js

Line 42 in dbb3555

$(settings.submitBtn).prop("disabled", true);

is never enacted.

I'd have expected other to have noted this, so may be missing something, but the expected disable behaviour does remain if submitBtn: ".submit-btn", is manually added as an option (and your button has this class, of course).