Release/2.7.0

[VirginiaBalseiro]

This PR bumps the version to 2.7.0.

Checklist

• I used npm version <major|minor|patch> to update package.json, inspecting the changelog to determine if the release was major, minor or patch.
• The CHANGELOG has been updated to show version and release date - https://keepachangelog.com/en/1.0.0/.
• @since X.Y.Z annotations have been added to new APIs.
• The only commits in this PR are:
  • the CHANGELOG update.
  • the version update.
  • @since annotations.
• I will make sure not to squash these commits, but rebase instead.
• Once this PR is merged, I will push the tag created by npm version ... (e.g. git push origin vX.Y.Z).