[Editorial] by-by -> bye-bye

src/epub/text/chapter-2-2.xhtml

@@ -183,7 +183,7 @@
 				<p>“Let’s have dinner together.”</p>
 				<p>“Sorry. I told Sukey Brett I’d eat with him.”</p>
 				<p>“Oh.”</p>
-				<p>“By-by.”</p>
+				<p>“Bye-bye.”</p>
 				<p>Amory crossed the street and had a highball; then he walked to Washington Square and found a top seat on a bus. He disembarked at Forty-third Street and strolled to the Biltmore bar.</p>
 				<p>“Hi, Amory!”</p>
 				<p>“What’ll you have?”</p>