Yii HTML 3.6

Version 3.6 of Yii HTML package is released. There are some improvements and fixes:

• Throw InvalidArgumentException in Html::renderAttribute() when attribute name is empty or contains forbidden symbols.
• Add Stringable and array values support to textarea tag.
• Add backed enumeration value support to CheckboxList and RadioList widgets.
• Fix output of null value attributes in Html::renderTagAttributes().