Merge pull request markedjs#3 from gibson042/document-xhtml

Document the xhtml option

README.md

@@ -37,7 +37,8 @@ marked.setOptions({
   pedantic: false,
   sanitize: false,
   smartLists: true,
-  smartypants: false
+  smartypants: false,
+  xhtml: false
 });
 
 console.log(marked('I am using __markdown__.'));
@@ -271,6 +272,13 @@ Default: `false`
 
 Use "smart" typograhic punctuation for things like quotes and dashes.
 
+### xhtml
+
+Type: `boolean`
+Default: `false`
+
+Self-close the tags for void elements (<br/>, <img/>, etc.) with a "/" as required by XHTML.
+
 ## Access to lexer and parser
 
 You also have direct access to the lexer and parser if you so desire.