fix: add missing attributes in extension-link

[Manueljlin]

Despite rel and class already being defined as an attribute in addAttributes(), the interface was missing these two particular attributes so it wasn't accessible when using TypeScript without workarounds.

Please describe your changes / How did you accomplish your changes

I added the missing attributes to the interface

How have you tested your changes

Full disclosure, I haven't tested it yet. This is a quick PR that I made from GitHub's web editor so that I don't forget to test it later and submit a fix properly.

How can we verify your changes

Open a typescript file and try to add a link through

editor?.value?.chain().focus()?.extendMarkRange('link')
  .setLink({
    href: 'https://google.es',
    class: 'button' // this will give you an error without this PR
  })

Remarks

Checklist

• The changes are not breaking the editor (untested)
• Added tests where possible (not applicable)
• Followed the guidelines (haven't read yet, sorry :(
• Fixed linting issues (not applicable I think?)

Related issues

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[bdbch]

good find!

The base branch was changed.