Broken link to CONTRIBUTING.md in README.md

[talkor]

• I confirm that this is an issue rather than a question.

Bug report

Steps to reproduce

1. Go to README.md.
2. Click on Contribute under "Code Contributors".

What is expected?

Should open the CONTRIBUTING.md page.

What is actually happening?

Page doesn't exists (404).

Other relevant information

• Output of npx vuepress info in my VuePress project:

[kefranabg]

Fixed in #1954