Dead link in the README.md

Hi,

I found that this link https://ruby-doc.org/stdlib/exts/readline/Readline.html in the README.md is 404 Not Found.

❯ curl -X GET -IL https://ruby-doc.org/stdlib/exts/readline/Readline.html
HTTP/1.1 302 Found
Date: Wed, 08 Jan 2025 16:38:30 GMT
Server: Apache/2.4.29 (Ubuntu)
Location: https://ruby-doc.org/3.4.1/exts/readline/Readline.html
Content-Length: 317
Content-Type: text/html; charset=iso-8859-1

HTTP/1.1 404 Not Found
Date: Wed, 08 Jan 2025 16:38:31 GMT
Server: Apache/2.4.29 (Ubuntu)
Last-Modified: Mon, 03 Jul 2023 00:21:33 GMT
ETag: "1c42-5ff8a261a6507"
Accept-Ranges: bytes
Content-Length: 7234
Content-Type: text/html

/stdlib/exts/readline/Readline.html does not exist in 3.4.1 doc. There are a few pages related to Readline but they appear blank.

3.3.6 has the same issue.

3.2.6 does not have the issue. https://ruby-doc.org/3.2.6/exts/readline/Readline.html exists.

I am not sure what approach is the best:

• Report it to the maintainer of the English version of ruby-org to ask them to revert the page (if possible)
• Update the link in the README.md to https://ruby-doc.org/3.2.6/exts/readline/Readline.html
• Update the link in the README.md to https://github.com/ruby/readline-ext or https://www.rubydoc.info/gems/readline-ext/file/README.md or https://www.rubydoc.info/gems/readline-ext/Readline

so just reporting it to the Reline maintainers.

Start in README.md and inspect the broken Readline documentation link. Check the candidate ruby-doc.org, ruby/readline-ext, and rubydoc.info destinations listed in the issue, then confirm the preferred target with the Reline maintainers. Done means README.md no longer points to the reported 404 page.