Adding an "Update Item" function

I usually follow my literature of interest by RSS feed. It often happens that I pull some papers in their ASAP (As Soon As Publishable) version, therefore fields such as publication date or volume number are left empty. Nevertheless these papers are uniquely identified by their doi url.

It would by nice to add an "update item" function based on the doi url, by right clicking on the item. This way all the ASAP papers could be easily updated, and could be ready to export for citation.
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