Fix no attributes in simple list

Author: joshbruce

composer.lock

@@ -37,7 +37,9 @@ public function unfold(): string
             $container = 'dl';
 
         }
-        return Html::$container(...$listItems)->unfold();
+
+        $attributes = $this->getAttr();
+        return Html::$container(...$listItems)->attr(...$attributes)->unfold();
     }
 
     public function ordered(): SimpleList

src/UIKit/Elements/Simple/SimpleList.php

@@ -44,6 +44,13 @@ public function testSimpleList()
             'good-bye'
         )->unfold();
         $this->assertEquals($expected, $result);
+
+        $expected = '<ul class="test"><li>hello</li><li>good-bye</li></ul>';
+        $result = UIKit::listWith(
+            'hello',
+            'good-bye'
+        )->attr("class test");
+        $this->assertEquals($expected, $result->unfold());
     }
 
     public function testSimpleOrderedList()