Updated README

README.md

@@ -75,6 +75,7 @@ You may set one of the following options on the parser object before parsing:
 - `$parser->maximumNestingLevel = int` to set the maximum level of nested elements to parse.
 - `$parser->maximumNestingLevelThrow = true` to throw if the maximum nesting level is exceeded.
 - `$parser->keepListStartNumber = false` to ignore the starting numbers of ordered lists.
+- `$parser->keepReversedList = true` to enable ordered lists with descending numbers.
 - `$parser->headlineAnchors = true` to add GitHub-style anchors when rendering headings.
 
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