Subject: [quicwg/base-drafts] cd6667: Fix README link to CONTRIBUTING guidelines

From: Paul Mabileau <[email-masked]>
Date: Fri, 20 Nov 2020 11:59:40 -0800

Branch: refs/heads/master
  Home:   https://github.com/quicwg/base-drafts
  Commit: cd6667a66f91743bdb614aa48514f76491935100
      https://github.com/quicwg/base-drafts/commit/cd6667a66f91743bdb614aa48514f76491935100
  Author: Paul Mabileau <[email-masked]>
  Date:   2020-11-20 (Fri, 20 Nov 2020)

  Changed paths:
    M README.md

  Log Message:
  -----------
  Fix README link to CONTRIBUTING guidelines

The `main` branch does not exist, `master` is the correct one.

Signed-off-by: Paul Mabileau <[email-masked]>