meta: ensure README is correctly formatted when doing releases (#3499)

.github/workflows/release-candidate.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Prepare changelog
         run: corepack yarn workspace @uppy-dev/release update-changelogs releases.json | xargs git add
       - name: Update contributors table
-        run: corepack yarn contributors:save && git add README.md
+        run: corepack yarn contributors:save && remark -foq README.md && git add README.md
       - name: Update CDN URLs
         run: corepack yarn workspace @uppy-dev/release update-version-URLs | xargs git add
       - name: Stage changes and remove temp files