commands: Implement next and prev

This is a naive implementation, which cannot deal with multiple children or parents stemming from merges. Note: I currently gave each command separate a separate argument struct for extensibility. Fixes #878
jj-vcs · Jul 5, 2023 · cbbb91d · cbbb91d
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -121,6 +121,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * `jj branch list` can now be filtered by revset.
 
+* `jj next` and `jj prev` are added, these allow you to traverse the history
+  in a linear style, see [#NNN](https://github.com/martinvonz/jj/issues/NNN)
+  for further pending improvements.
+
 ### Fixed bugs
 
 * Modify/delete conflicts now include context lines