Fix broken link in CONTRIBUTING.md

[tavoyne]

What?

The link to the PDF reference was dead in CONTRIBUTING.md. I updated it.

It's now pointing to version 32000-1:2008.

Why?

N/A

How?

N/A

Testing?

N/A

New Dependencies?

N/A

Screenshots

N/A

Suggested Reading?

N/A

Anything Else?

N/A

Checklist

• [x] I read CONTRIBUTING.md.
• [x] I read MAINTAINERSHIP.md#pull-requests.
• N/A I added/updated unit tests for my changes.
• N/A I added/updated integration tests for my changes.
• N/A I ran the integration tests.
• N/A I tested my changes in Node, Deno, and the browser.
• N/A I viewed documents produced with my changes in Adobe Acrobat, Foxit Reader, Firefox, and Chrome.
• N/A I added/updated doc comments for any new/modified public APIs.
• N/A My changes work for both new and existing PDF files.
• N/A I ran the linter on my changes.

[dan-willett]

@Hopding Are there any other people with write access that can review changes? If not, would you please consider adding some additional people who have shown they have the skill to review changes? It appears that you have been AWOL since November 2021. An important project like this one should not rely on just one person. Things come up, and one person may not be able to spend the time needed to approve changes that are ready to go and need to be merged...

[bjbk]

@Hopding I sure hope you are OK. Love pdf-lib but if it is suddenly no longer in active development, perhaps someone else can take up maintenance.