Same urlize() everywhere.

lib/markdown.lua

@@ -5,7 +5,7 @@
 
 **Author:** Niklas Frykholm, <[email protected]>
 **Date:** 31 May 2008
-**Edited by:** Marcus Thunström (2018-06-14, 2021-05-06)
+**Edited by:** Marcus Thunström (2018-06-14, 2021-05-31)
 
 This is an implementation of the popular text markup language Markdown in pure Lua.
 Markdown can convert documents written in a simple and easy to read text format
@@ -271,16 +271,6 @@ local function strip_html(html)
 	return text
 end
 
-local function urlize(text)
-	text = text
-		:lower()
-		:gsub("[%p ]+", "-")
-		:gsub("^%-+", "")
-		:gsub("%-+$", "")
-
-	return text == "" and "-" or text
-end
-
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