max-length and min-length attributes does not work properly for non-empty model

[rumartcer]

Hello! maxlength and minlength validation does not work properly if length of initial value is invalid. $valid flag in ngModelController is true and $error object is empty. But it's wrong behavior as it differs from usual input field. If I change ngModel value in quill - validation starts working. This is only about ng-quill's maxlength and minlength validation. For example required validation works well. Example in plunkr.

[KillerCodeMonkey]

should be fixed in 4.5.1.

there was a missing validation call after the editor gets init and initial content set.