fix: 🐛 syntax highlighter

rcmoutinho · rcmoutinho · commit df8f339f2389 · 2020-04-13T20:45:27.000-04:00
diff --git a/java6-to-java8.asc b/java6-to-java8.asc
@@ -7,7 +7,7 @@ Rinaldo Pitzer Jr.; Rodrigo Moutinho
 :pagenums:
 :front-cover-image: image:images/cover.png[width=1050,height=1600]
 :icons: font
-:source-highlighter: pygments
+:source-highlighter: rouge
 
 :appendix-caption: Appendix
 :toc-title: Table of Contents
