Changelog

As agreed at the 2019-12-10 Contributor Call, we are going to include the following in the release changelog: 

• Communication of future breaking changes or deprecated functionality 
• New features with a short description of the functionality 
• Fixed bugs with a description of the user impact

The following will no longer be included: 

• Every PR contributing to a larger feature
• Internal technical improvements with no user impact 
• Bugs fixed in unreleased features 

For changes that are to be included in the changelog, the PR author (or feature developer where a number of PRs contribute to the same feature)
also commits changes on CHANGELOG.md in the same PR as part of the development process. 

A documentation team member will review and finalize CHANGELOG.md for the release.