v0.6.3

• updates documentation (c0905e7)
• fixes rank in Treemap and other minor issues (5647a42)
• merging to get latest update, still working on shape's ariaLabel (add4042)
• fixes internal assignment of node index (637d432)
• sets ariaLabel in the constructor (2020513)
• removes linter erros and instances of constructAriaLabel function. (a1c2503)
• corrected aria-label rank in treemap.js (7254ff7)
• Adds suppoprt for aria-label attribute in Treemap.js (2dbf7a5)
• sets support for aria-label attribute in Tree.js (6fe39b2)
• Adds support for aria-label attribute in Pie.js. (d87a995)