resolve #16

tests/data/dense_list.md

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+Here's a regular list:
+
+- list item
+- another list item
+- 3rd list item
+
+Here's one with white space around items:
+
+  - list item  
+  - another list item  
+
+Here's one with too much space before items:
+
+    - list item
+    - another list item
+
+Here's one with no space after markers:
+
+-list item
+-another list item
+
+Here's one where items contain line breaks:
+
+- list
+item
+- another
+list item