Minor depth calculation fixes#3

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Commits on Jan 21, 2019

Ensure `Package::$resolves` is set.
Stéphan Kochen
committed
Ensure depth is calculated when using `getPackagesByDepth()`.
Stéphan Kochen
committed
Fix the namespace in the readme.
Stéphan Kochen
committed
Fix the depth query example in the readme.
Stéphan Kochen
committed