- Enh #131 Added `tabContentOptions` to set HTML attributes for 'tab-content' container in `Tabs` widget (AndrewKorpusov)
- Enh #145: Added the ability to customize the class used to draw dropdowns in `yii\bootstrap\Nav`, `yii\bootstrapButtonDropdown` and `yii\bootstrap\Tab` widgets (PowerGamer1)
- Bug #126:`yii\bootstrap\ToggleButtonGroup` was unable to work without model (makroxyz)
- Bug #130: Fixed `yii\bootstrap\Collapse` to use pure numerical value on `content` property (meysampg)
- Enh #174: Added `yii\bootstrap\Tabs::renderPanes()` to allow extending the class to manipulate the content between the tabs and the content (thiagotalma)
- Bug #196: Remove `role="form"` from `yii\bootstrap\ActiveForm` according to new aria specification (bastardijke)