fix link in user showcase

Author: knolleary

index.html

@@ -121,7 +121,7 @@ <h4>In the cloud</h4>
         <div class="content">
             <h3>Who's using Node-RED?</h3>
             <ul id="user-list">
-                <li><a href="https://vwww.vigilent.com"><img src="users/vigilent.png"/></a></li>
+                <li><a href="https://www.vigilent.com"><img src="users/vigilent.png"/></a></li>
                 <li><a href="https://entelligently.com"><img src="users/entelligently.png"/></a></li>
                 <li><a href="https://st-one.io/"><img src="users/st-one.png"/></a></li>
                 <li><a href="https://www.aiomeet.com/"><img src="users/aiomeet.png"/></a></li>
@@ -178,4 +178,4 @@ <h3>On the blog <a class="box-link" href="/blog/">more</a></h3>
         list.empty();
         items.appendTo(list);
     })
-</script>
+</script>