npm / arborist / #515

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Correctly create shrinkwrap when root is a symlink

This ensures that the nodes in the inventory are properly walked,
and that the resulting shrinkwrap file is relative to the _target_
of the symlink root, rather than the symlink path.

PR-URL: https://github.com/npm/arborist/pull/191
Credit: @isaacs
Close: #191
Reviewed-by: @nlf @ruyadorno

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