changelog: thank people who contributed to a release

Thanks, everyone! :) I'm happy to rephrase the text. I included people
in order of their first contribution in the release. I included their
full name and the GitHub username.

.github/PULL_REQUEST_TEMPLATE.md

@@ -12,3 +12,4 @@ rewrite a branch).
 If applicable:
 - [ ] I have updated `CHANGELOG.md`
 - [ ] I have updated the documentation (README.md, docs/, demos/)
+- [ ] I have added myself to the contributors in `CHANGELOG.md` (optional)

CHANGELOG.md

@@ -95,6 +95,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * `jj git import` no longer crashes when all Git refs are removed.
 
+### Contributors
+
+Thanks to the people who made this release happen!
+
+ * Martin von Zweigbergk (@martinvonz)
+ * Benjamin Saunders (@Ralith)
+ * Yuya Nishihara (@yuja)
+ * Glen Choo (@chooglen)
+ * Ilya Grigoriev (@ilyagr)
+ * Ruben Slabbert (@rslabbert)
+ * Waleed Khan (@arxanas)
+
+
 ## [0.5.1] - 2022-10-17
 
 No changes (just trying to get automated GitHub release to work).