Fixes #184: `yii\bootstrap\ButtonDropdown` widget did not use the correct JS...

Fixes #184: `yii\bootstrap\ButtonDropdown` widget did not use the correct JS plugin, was `button`, changed to `dropdown`

ButtonDropdown.php

@@ -84,7 +84,7 @@ class ButtonDropdown extends Widget
         $options = $this->containerOptions;
         $tag = ArrayHelper::remove($options, 'tag', 'div');
 
-        $this->registerPlugin('button');
+        $this->registerPlugin('dropdown');
         return implode("\n", [
             Html::beginTag($tag, $options),
             $this->renderButton(),

CHANGELOG.md

@@ -18,6 +18,7 @@ Yii Framework 2 bootstrap extension Change Log
 - Bug #143: Fixed `yii\bootstrap\Nav` to use tags according to bootstrap docs (PowerGamer1)
 - Bug #162: Fixed `yii\bootstrap\Nav` not taking explicit `active` into account when `activateItems` is off (samdark)
 - Enh #174: Added `yii\bootstrap\Tabs::renderPanes()` to allow extending the class to manipulate the content between the tabs and the content (thiagotalma)
+- Bug #184: `yii\bootstrap\ButtonDropdown` widget did not use the correct JS plugin, was `button`, changed to `dropdown` (cebe, yukal)
 - Bug #196: Remove `role="form"` from `yii\bootstrap\ActiveForm` according to new aria specification (bastardijke)
 - Enh #208: Added `yii\bootstrap\Modal::$bodyOptions` to allow add options to body part Modal (KoJIT2009)