Add change 34 to instructions

how_to/Change_34.md

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+- data: Don't always dereference refs (for `ugit k`)
+
+Actually, it's not always desirable to dereference a ref all the way. Sometimes
+we would like to know at which ref a symbolic ref points, rather than the final
+OID. Or we would like to update a ref directly, rather then updating the last
+ref in the chain.
+
+One such usecase is `ugit k`. When visualizing refs it would be nice to see
+which ref points to which ref. We will see another usecase soon.
+
+To accomodate this, we will add a `deref` option to `get_ref`, `iter_refs` and
+`update_ref`. If they will be called with `deref=False`, they will work on the
+raw value of a ref and not dereference any symbolic refs.
+
+Then we will update `k` to use `deref=False`.