Merge branch 'develop' of github.com:hsz/bootstrap-bundle into hsz-develop

* 'develop' of github.com:hsz/bootstrap-bundle:
  When trying to render form with `file` element in it, there is an error:

Resources/views/Form/bootstrap.html.twig

@@ -156,7 +156,7 @@
         <div class="col-{{ col_size }}-{{ simple_col }}">
     {% endif %}
 
-    <input type="{{ type }}" {{ block('widget_attributes') }} {% if value is not empty %}value="{{ value }}" {% endif %}>
+    <input type="file" {{ block('widget_attributes') }} {% if value is not empty %}value="{{ value }}" {% endif %}>
 
     {% if simple_col is defined %}
         </div>