Update word count in metadata

src/epub/content.opf

@@ -67,7 +67,7 @@
 		<dc:source>https://www.google.com/books/edition/Clotel_or_The_president_s_daughter/JLoBAAAAQAAJ</dc:source>
 		<meta property="se:production-notes">(1) I chose to go with the first edition of this book. Later editions were substantially different: changing the names of characters, the title of the book, and making significant plot changes. See https://www.persee.fr/doc/cchav_0184-1025_2002_num_32_1_1334 for some notes on the various editions. (2) The PG transcription omitted the author's autobiographical introduction; I have restored this. (3) The original usually uses "negro" uncapitalized; PG corrected this to "Negro"; I reverted this to the original. (4) The original smooshes a lot of back-and-forth dialog into single paragraphs; I've untangled this into one-paragraph-per-speaker in the modern style. (5) In Chapter 12, a character's pronunciation of the word hair is confusingly rendered as "'hair'" in one place, "'hare'" in another; I am guessing that the intention of the author was "har" (a later edition supports this guess), which is how he renders it in another chapter, and I have altered the chapter to use "har".</meta>
 		<meta property="se:word-count">71730</meta>
-		<meta property="se:reading-ease.flesch">66.07</meta>
+		<meta property="se:reading-ease.flesch">66.27</meta>
 		<meta property="se:url.encyclopedia.wikipedia">https://en.wikipedia.org/wiki/Clotel</meta>
 		<meta property="se:url.vcs.github">https://github.com/standardebooks/william-wells-brown_clotel</meta>
 		<dc:creator id="author">William Wells Brown</dc:creator>