0.1.0

• Blockquote block can handle universal newlines.
• Table can handle multiple rows addition.
• MarkdownIO documents can be merged with + operator.
• Table header can be aligned (left, right, center).
• Fix nested list render.

0.0.2

• Add paragraph block.
• Fix int in table.

0.0.1

• Add MarkdownIO basics.
• Add markdown block elements.
• Add markdown span elements.