2.6.0

• Added CompactRenderer.
• Renderers can now control rendering of top/bottom/separator rows.
• [experimental] Added hideHeader() and showHeader() methods to TextTable.
• Any method that accepts string acceprts objects implementing \Stringable interface too.
• Added Separator row class, and Table::addSeparator() helper method.
• Fixed DuplicateColumnException and UnsupportedColumnAlignException exceptions
• Improved documentation.