Code example of the section ”Using in a script“ in the README is already old.

The following example does not work. https://github.com/gjtorikian/html-proofer/blob/d662d85b73d80f58e8164db531eb7688b3b72e77/README.md?plain=1#L91-L114 It probably be for html-pipeline version before 3.0.0.