update the changelog for a new release

[bhazelton]

Description

Release a new version.

Motivation and Context

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Reference simulation update or replacement
• [ ] Documentation change (documentation changes only)
• [x] Version change
• [ ] Build or continuous integration change

Checklist:

For all pull requests:

• [x] I have read the contribution guide.
• [x] My code follows the code style of this project.

Version change checklist:

• [x] I have updated the CHANGELOG to put all the unreleased changes under the new version (leaving the unreleased section empty).
• [x] I have run the appropriate tests for this level of version change (described in the readme under versioning).

[codecov[bot]]

Codecov Report

Merging #402 (5fe98fd) into main (421d047) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #402   +/-   ##
=======================================
  Coverage   99.34%   99.34%           
=======================================
  Files          13       13           
  Lines        2131     2131           
=======================================
  Hits         2117     2117           
  Misses         14       14           

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