Update series information in metadata

src/epub/content.opf

@@ -60,7 +60,7 @@
 		<meta property="collection-type" refines="#collection-2">set</meta>
 		<meta property="group-position" refines="#collection-2">100</meta>
 		<meta id="collection-3" property="belongs-to-collection">Pulitzer Prize Winners</meta>
-		<meta property="collection-type" refines="#collection-3">set</meta>
+		<meta property="collection-type" refines="#collection-3">series</meta>
 		<meta property="group-position" refines="#collection-3">2</meta>
 		<dc:description id="description">The scion of an old-money Midwestern family must cope with their waning fortunes and the changes brought on by industry and the automobile age.</dc:description>
 		<meta id="long-description" property="se:long-description" refines="#description">