message: Add prerequisite for migration
diff: @@ -63,6 +63,8 @@ The v1 SST constructs were restrucrtured with the following goals in mind:
  ## Upgrade Steps
  Estimated time: 15 minutes
  +Prerequisite: Update SST to v0.59.0 or later
  +
  1. Run `npx sst update 1.0.0-beta.5`
  2. For each SST construct used in your app, find its corresponding section in the [Changelog](#changelog) below, and follow the steps to update.
  3. Ensure that all the constructs have been updated:
  