Fix HTML errors.

Range and color do not support "required" attribute

src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig

@@ -10,6 +10,10 @@
 
 {%- block form_widget_simple -%}
     {%- set type = type|default('text') -%}
+    {%- if type == 'range' or type == 'color' -%}
+        {# Attribute "required" is not supported #}
+        {%- set required = false -%}
+    {%- endif -%}
     <input type="{{ type }}" {{ block('widget_attributes') }} {% if value is not empty %}value="{{ value }}" {% endif %}/>
 {%- endblock form_widget_simple -%}