github: add reminder to update config schema in PRs
We have forgotten this many times already.
@@ -13,4 +13,5 @@ https://github.com/martinvonz/jj/blob/main/docs/contributing.md for details.
If applicable:
- [ ] I have updated `CHANGELOG.md`
- [ ] I have updated the documentation (README.md, docs/, demos/)
+- [ ] I have updated the config schema (src/commands/config-schema.json)
- [ ] I have added tests to cover my changes
