Add Sadie Bartholomew as author

[davidhassell]

See issue #XXX for discussion of these changes.
New authorship partially omitted from #469 - rectifying that here.

Release checklist

• Authors updated in cf-conventions.adoc?
• Next version in cf-conventions.adoc up to date? Versioning inspired by SemVer.
• history.adoc up to date?
• Conformance document up-to-date?

For maintainers

After the merge remember to delete the source branch.
Tags are set at the conclusion of the annual meeting; until then, main always is a draft for the next version.

[sadielbartholomew]

Ah, sorry. I didn't realise we had to update two places to get our name included and I only added it in the later listing in a653314.

On that note, since both Chris Barker and I made the mistake of not adding our names in both places which seems very easy-to-do IMO (as I gather from the email thread on this), it seems like it would be useful and wise to indicate briefly in the PULL_REQUEST_TEMPLATE.md that two additions are required, for example I suggest something like:

diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 269c93e..98b7438 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -1,7 +1,7 @@
 See issue #XXX for discussion of these changes.
 
 # Release checklist
-- [ ] Authors updated in `cf-conventions.adoc`?
+- [ ] Authors updated in `cf-conventions.adoc` (in two places: on line 3 and under `.Additional Authors` in `About the authors`)?
 - [ ] Next version in `cf-conventions.adoc` up to date? Versioning inspired by [SemVer](https://semver.org).
 - [ ] `history.adoc` up to date?
 - [ ] Conformance document up-to-date?

(I am assuming the 'Original Authors' will remain static given its nature.)

[sadielbartholomew]

Oh and, since I have now noticed this and it bugs me somewhat, to make the grammar consistent on the final two points I would also like to do:

diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 269c93e..4070de7 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -3,7 +3,7 @@ See issue #XXX for discussion of these changes.
 # Release checklist
 - [ ] Authors updated in `cf-conventions.adoc`?
 - [ ] Next version in `cf-conventions.adoc` up to date? Versioning inspired by [SemVer](https://semver.org).
-- [ ] `history.adoc` up to date?
+- [ ] `history.adoc` up-to-date?
 - [ ] Conformance document up-to-date?
 
 # For maintainers

(Putting a PR up to request these minor tweaks. Too minor for an Issue I think, but the PR can always be closed if the changes are deemed not suitable.)