npm / arborist / #1044

push

add extra info to node.explain

Added to the result object of node.explain():
- isWorkspace, boolean value, true when a node is a workspace
- linksIn, array containing all links to a target

PR-URL: https://github.com/npm/arborist/pull/285
Credit: @ruyadorno
Close: #285
Reviewed-by: @isaacs

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