prep release

[olipyskoty]

Contributing to Twilio

All third party contributors acknowledge that any contributions they provide will be made under the same open source license that the open source project is provided under.

• I acknowledge that all my contributions will be made under the project's license.

Pull Request Details

Description

This PR adds CHANGELOG entry and updates version to 0.7.0 to release gallery view feature.

Burndown

Before review

• Updated CHANGELOG.md if necessary
• Added unit tests if necessary
• Updated affected documentation
• Verified locally with npm test
• Manually sanity tested running locally
• Included screenshot as PR comment (if needed)
• Ready for review

Before merge

• Got one or more +1s
• Re-tested if necessary

[timmydoza]

Readme looks good!

Just need to also update the version on line 9 pf package-lock.json:

Also, I'm wondering if we should update twilio-video to 2.22.0? It was released just an hour ago. Might be good to toss in here.