setup.rb in yard-0.5.4

- old
+ new

@@ -49,10 +49,10 @@
     @contents
   when 'txt'
     "<pre>#{@contents}</pre>"
   when 'textile', 'txtile'
     htmlify(@contents, :textile)
-  when 'markdown', 'md', 'mdown'
+  when 'markdown', 'md', 'mdown', 'mkd'
     htmlify(@contents, :markdown)
   else
     htmlify(@contents, diskfile_shebang_or_default)
   end +
   "</div>"
\ No newline at end of file