Set maxage to 2592000 for admin status badge

templates/misc/admin_bar.tmpl

@@ -41,7 +41,7 @@
                 <img 
                     class="adminbar align hide-mobile" 
                     style="width:55px;margin-top:-3px" 
-                    src="https://img.shields.io/uptimerobot/status/m780912498-752f7edbb4dbba05feb9e8ec.svg?style=flat-square"
+                    src="https://img.shields.io/uptimerobot/status/m780912498-752f7edbb4dbba05feb9e8ec.svg?style=flat-square&maxAge=2592000"
                 >
             </div>
         </div>