Makes the following transformations:
**double-asterisks**
for bold text_underscores_
for italics- Three-space indents for lists
- Bullets (
*
) for unordered lists- Alternating bullets for sub-lists (between
-
and+
)
- Alternating bullets for sub-lists (between
- One line between paragraphs and headers
- No ATX headers
- No trailing whitespace (accept the last block) or "double-space" returns