.yardopts in rpub-0.4.0 vs .yardopts in rpub-0.5.0

@@ -1,8 +1,9 @@
 --no-private
 --title "Rpub, a simple ePub generator library in Ruby"
 --readme README.md
 --markup markdown
 --markup-provider kramdown
+--output-dir doc/api
 -
 HISTORY.md
 LICENSE