I followed the following procedure to make these changes:

* I used maint/changed_crates to find out which crates had changed
  since 0.3.0.
* I used grep and maint/list_crates to sort those crates in
  topological (dependency) order.
* I looked through semver_status to find which crates were listed as
  having semver-relevant changes (new APIs and breaking changes).
* I scanned through the git logs of the crates with no
  semver-relevant changes listed to confirm that, indeed, they had
  no changes.  For those crates, I incremented their patch-level
  version _without_ changing the version that other crates depend on.
* I scanned through the git logs of the crates with no
  semver-relevant changes listed to confirm that, indeed, they had
  no obvious breaking changes.
* I treated all crates that depend on `arti` and/or `arti-client` as
  having breaking changes.
* I identified crates that depend on crates that have changed, even
  if they have not changed themselves, and identified them as having
  a non-breaking change.
* For all of the crates, I used `cargo set-version -p $CRATE --bump
  $STATUS` (where `STATUS` is `patch` or `minor`) to update the
  versions, and the depended-upon versions.