Add changelog entry

[matthewfranglen]

Relates to https://github.com/nchammas/flintrock/pull/311

This is the changelog for that PR.

[nchammas]

Thanks for submitting this PR, @matthewfranglen. Most contributors don't think to add a change log for their PRs!

Generally speaking, I like to write change logs myself since I can summarize changes and place them in the appropriate context as maintainer.

If you'd like to try polishing this change log entry up, then what I'd suggest is:

• Please fix the PR link using the appropriate Markdown syntax, similar to the other change log entries.
• Please add a "Changed" heading, similar to the other change log entries.
• Please add the appropriate punctuation and add a brief note explaining why this change is useful.

But don't feel obliged to do this! As I said, I prefer to write change logs myself. But since you demonstrated interest, I thought I'd lay out what I would do if I were writing this change log.

[matthewfranglen]

I've made the changes you have suggested. I understand your desire to write your own changelog so feel free to close this.

[nchammas]

Looks good to me. Thanks for the update! I will push a few minor edits to your branch, if you don't mind, and merge this in this weekend.