ember-cli-updates.json schema makes it seem like multiple blueprint to one package is supported but the code does not reflect that

According to the [schema](https://github.com/ember-cli/ember-cli-update/wiki/Config-Schema), the `blueprints` attribute is an array of objects. It makes it seem like the CLI is able to support bumping multiple blueprints from one package. Either I totally missed something in the code or the code doesn't reflect supporting bumping multiple blueprints from one package