v0.4.5

• Avoid to use the index of an item as its key when rendering a list. (4179b13)
• Bug fix: Tables are abnormal when table includes sub table. (2e8ea08)
• Columns width should be able to set percentage. (64b11d3)
• If the total width of table cells is smaller than table width, averagely split extra space to other columns. (37ac92a)