Update Vendored Erubis to 2.6.6

vendor/plugins/erubis/examples/basic/example.ephp

@@ -0,0 +1,17 @@
+<%
+   $user = "World";
+   $list = array('<aaa>', 'b&b', '"ccc"');
+%>
+<p>Hello <%= $user %>!</p>
+<table>
+  <tbody>
+    <% $i = 0 %>
+    <% foreach ($list as $item) { %>
+    <%   $i++; %>
+    <tr bgcolor="<%= $i % 2 == 0 ? '#FFCCCC' : '#CCCCFF' %>">
+      <td><%= $i %></td>
+      <td><%== $item %></td>
+    </tr>
+    <% } %>
+  </tbody>
+</table>