Add Harvard Classics Shelf of Fiction collection

src/epub/content.opf

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 		<meta id="collection-1" property="belongs-to-collection">Encyclopædia Britannica’s Gateway to the Great Books</meta>
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+		<meta id="collection-2" property="belongs-to-collection">Harvard Classics Shelf of Fiction</meta>
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 		<dc:description id="description">A collection of short stories by Guy de Maupassant, in order of date of composition.</dc:description>
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 			&lt;p&gt;&lt;a href="https://standardebooks.org/ebooks/guy-de-maupassant"&gt;Guy de Maupassant&lt;/a&gt; is considered one of the preeminent writers in the realm of the short story. In a little over a decade he produced almost three hundred stories, many of which (e.g. “Boule de Suif,” “The Little Soldier”) are judged to be classics of the genre.&lt;/p&gt;