Update book config for a potential new edition

chromatic · chromatic · commit c2820ccade91 · 2021-07-22T14:49:25.000-07:00
diff --git a/book.conf b/book.conf
@@ -1,16 +1,16 @@
 [book]
 author_name=chromatic
-copyright_year=2015
-cover_image=images/2014_cover.png
+copyright_year=2021
+cover_image=
 language=en
 title=Modern Perl
-subtitle=4th edition
+subtitle=development edition
 filename_template=modern_perl
 build_index=1
 build_credits=1
 build_chapters=1
-ISBN10=1680500880
-ISBN13=978-1680500882
+ISBN10=
+ISBN13=
 
 [layout]
 chapter_name_prefix=chapter
