Jakub Kuszneruk

It looks like checkbox field is rendered separately [here](https://github.com/mbr/flask-bootstrap/blob/master/flask_bootstrap/templates/bootstrap/wtf.html#L40), but `descriptor` field is rendered for other field types only [here](https://github.com/mbr/flask-bootstrap/blob/master/flask_bootstrap/templates/bootstrap/wtf.html#L115). Would be someone interested in merging pull request if I've...

And workaround if someone needed: ```python class Form(FlaskForm): text = StringField(description='Some visible text') unique = BooleanField(label='Unique - Bow this "description" is visible') ```