Define a parser for list line tokens, update line token parser

src/MdToHTML.hs

@@ -262,7 +262,11 @@ allParsers = parseHeader : lineParsers
 
 -- Parse any of the line tokens.
 parseLineToken :: ReadP MdToken
-parseLineToken = choice lineParsers
+parseLineToken = fallthroughParser lineParsers
+
+-- Parse any of the list line tokens.
+parseListLineToken :: ReadP MdToken
+parseListLineToken = fallthroughParser listLineParsers
 
 -- Parse a line, consisting of one or more tokens.
 parseLine :: ReadP MdToken