Need info on ember source version

Hi

The latest version of `ember-drag-drop` is 1.0.1. Usually packages specify ember-cli, ember-source versions in the package.json but i could not see any such info in the latest version. There is some info on ember-cli version mentioned in `test-app` folder but since its in tests folder not sure how reliable it is. Any reason for not specifying the exact ember-source version?

Start by checking the root package.json and README to confirm how Ember-related dependencies are currently declared, then inspect test-app/package.json since it is explicitly mentioned. Look for any contributor or compatibility notes that explain versioning expectations. A good outcome is a clear doc/metadata update (or a maintainer response) stating whether ember-source should be pinned, ranged, or intentionally omitted and why.

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