README refers to isemail - no longer involved

[MikeMcC399]

Issue

The README document introduces itself with the description:

Extracts links from markdown texts and checks whether each link is alive (200 OK) or dead. mailto: links are validated with isemail.

The reference to isemail is however no longer correct.

b4fe219 bumped link-check from ^5.3.0 to ^5.4.0

• [email protected] uses isemail
• [email protected] uses node-email-verifier

Suggestion

The outdated reference to isemail should be removed from the README document.

Should the reference to isemail be replaced by a reference to node-email-verifier, which is not a direct dependency of markdown-link-check, or should the name of the indirect dependency that validates mailto: links be omitted at the level of markdown-link-check?