Show more helpful usage when arguments for hikidoc is wrong

KitaitiMakoto · KitaitiMakoto · commit 09853fa0c79f · 2017-10-13T15:54:42.000+09:00
diff --git a/bin/hikidoc b/bin/hikidoc
@@ -46,7 +46,7 @@ when 0
 when 1
   title, text = ARGV[0], File.read(ARGV[0])
 else
-  abort usage
+  abort ARGV.options.help
 end
 
 body = HikiDoc.to_html(text, format_options)
