Fix for multiple Select (#113)

The value of multiple attribute in the select element should be a boolean.

Author: labnol

Diff for: kitchen-sink.html

@@ -104,7 +104,7 @@ <h2 class="text-2xl font-bold">Reset styles</h2>
             </label>
             <label class="block">
               <span class="text-gray-700">Select (multiple)</span>
-              <select class="form-multiselect block w-full mt-1" multiple="">
+              <select class="form-multiselect block w-full mt-1" multiple>
                 <option>Option 1</option>
                 <option>Option 2</option>
                 <option>Option 3</option>