Releasing a new version of Leaflet

Update the changelog since last release and commit.
Run npm version <patch | minor | major> (this will bump the version in package.json and create a new tag).
Run git push --follow-tags to push the commit created by NPM to Github (together with the tag).
Wait for the CI to complete and follow the logs to make sure it runs successfully.
Verify that the release was correctly published to NPM by checking:
- Leaflet NPM package page
- files on Leaflet unpkg page
Make a new release on Leaflet's GitHub release page with the most important parts of the changelog

Make a new branch for the update
Write a blog post about the new release and put it in /docs/_posts
If necessary to preserve previous version's docs, rename dist/reference.html to dist/reference-X.Y.Z.html and add it to the list in docs/reference-versions.html
Run npm run docs to generate the new docs/reference.html
Run npm run integrity and make sure docs/_config.yml is updated with new hashes
Update link to latest release in docs/download.md
Update the announcement section in docs/index.html
Commit all the changes and submit a PR for someone to review

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