Fixed typo in long description

src/epub/content.opf

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 		<dc:description id="description">A collection of science fiction stories by H. Beam Piper ordered by date of publication.</dc:description>
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-			&lt;p&gt;&lt;a href="https://standardebooks.org/ebooks/h-beam-piper"&gt;H. Beam Piper&lt;/a&gt; was a well-regarded and popular American science fiction author active in the 1940s, 1950s and early 1960s, who published many science fiction short stories, novelettes, novellas and novels. One major strand in his writing is envisioning a future history based on human civilization expanding throughout the galaxy, with a rather paternalistic approach to sentient alien species. Another important theme was Piper’s concept of “Paratime”: the idea that there are many parallel timelines branching off from each other, and that it’s possible—with the right technology—to move, and even carry out commerece, between these different timelines. Many of these stories are also frequently feature a rather tongue-in-cheek humor.&lt;/p&gt;
+			&lt;p&gt;&lt;a href="https://standardebooks.org/ebooks/h-beam-piper"&gt;H. Beam Piper&lt;/a&gt; was a well-regarded and popular American science fiction author active in the 1940s, 1950s and early 1960s, who published many science fiction short stories, novelettes, novellas and novels. One major strand in his writing is envisioning a future history based on human civilization expanding throughout the galaxy, with a rather paternalistic approach to sentient alien species. Another important theme was Piper’s concept of “Paratime”: the idea that there are many parallel timelines branching off from each other, and that it’s possible—with the right technology—to move, and even carry out commerce, between these different timelines. Many of these stories are also frequently feature a rather tongue-in-cheek humor.&lt;/p&gt;
 			&lt;p&gt;This collection covers a wide range of his shorter fiction, almost all of which was published in various American science fiction magazines. One additional story included in this collection, “Rebel Raider,” however, is not science fiction or fantasy but a lightly-fictionalized account of events in the U.S. Civil War. A few of the stories were written in collaboration with John J. McGuire.&lt;/p&gt;
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