My site is Running Django 2.1 and Wagtail 2.4 and I get a TemplateDoesNotExist error and it's trying to load captcha/widget.html. What I found was if you add `captcha` to your settings file (along with `wagtailcaptcha`) it solves this problem. It'd be great if you through this in your main README.md file to help any newcomers get this up and running faster. #