Added upquote package

This is the same as dfc56094751c5a9660590dbe5061d18faa5bc756.

book.tex

@@ -13,6 +13,7 @@
 \usepackage{multirow}
 \usepackage{tcolorbox}
 \usepackage{color}
+\usepackage{upquote}
 
 \definecolor{lightgray}{gray}{1}
 \newcommand{\black}[1]{{\color{black} #1}}