Update index.html

Author: damli40

binderhub/templates/index.html

@@ -40,7 +40,7 @@ <h4 id="form-header" class='row'>Build and launch a repository</h4>
               </span>
               <span class="caret"></span>
               </button>
-              <ul role="list" class="dropdown-menu" id="provider_prefix_sel">
+              <ul class="dropdown-menu" id="provider_prefix_sel">
                 {% for provider_prefix, provider in repo_providers.items() %}
                   <li class="dropdown-item" value={{provider_prefix}}><a href="#">{{provider.display_name}}</a></li>
                 {% endfor %}