Checklist for this issue

If your issue is about the regex used in email rule, please note that as of version 1.12.0 this plugin is using the same regular expression that the HTML5 specification suggests for browsers to use (https://html.spec.whatwg.org/multipage/forms.html#valid-e-mail-address). We will follow their lead and use the same check. If you think the specification is wrong, please report the issue to them. If you have different requirements, consider using a custom method.
In case you need to adjust the built-in validation regular expression patterns, please follow the documentation (http://jqueryvalidation.org/jQuery.validator.methods/).

Subject of the issue

Bootstrap 4 support needs to be tested

Your environment

1.17.0

• Chrome

Steps to reproduce

jquery-validation/demo/bootstrap/index.html
needs to use Bootstrap 4.0.0 to test for bootstrap 4 support

Expected behaviour

jquery-validation/demo/bootstrap/index.html
needs to use Bootstrap 4.0.0 to test for bootstrap 4 support

Actual behaviour

jquery-validation/demo/bootstrap/index.html
uses Bootstrap 3