### Description of proposed changes
What is the goal of this pull request? What does this pull request change?

### Related issue(s)
<!-- Start typing the name of a related issue and GitHub will auto-suggest the issue number for you.  -->
Fixes #
Related to #

### Testing
What steps should be taken to test the changes you've proposed?
If you added or changed behavior in the codebase, did you update the tests, or do you need help with this?

<!-- 🙌 Thank you for contributing to Nextstrain! ✨ -->

### Checklist

- [ ] Add a message in [CHANGES.md](https://github.com/nextstrain/augur/blob/HEAD/CHANGES.md) summarizing the changes in this PR. Keep headers and formatting consistent with the rest of the file.

### Description of proposed changes
What is the goal of this pull request? What does this pull request change?

### Related issue(s)
<!-- Start typing the name of a related issue and GitHub will auto-suggest the issue number for you.  -->
Fixes #
Related to #

### Testing
What steps should be taken to test the changes you've proposed?
If you added or changed behavior in the codebase, did you update the tests, or do you need help with this?

<!-- 🙌 Thank you for contributing to Nextstrain! ✨ -->

### Checklist

- [ ] Add a message in [CHANGES.md](https://github.com/nextstrain/augur/blob/HEAD/CHANGES.md) summarizing the changes in this PR that are end user focused. Keep headers and formatting consistent with the rest of the file.

Update PR template changelog checklist
Update PR template changelog checklist

Update the language to reflect that entries in the changelog should
only be end user focused changes. Motived by @tsibley's comment¹ in a
recent PR.

It's nice for external users if our changelog is not bloated by
internal development changes!

¹ https://github.com/nextstrain/augur/pull/1039#discussion_r1014473787
