loop/webui: add prettier
diff --git a/loop/webui/src/web-components/demo/sketch-app-shell.demo.html b/loop/webui/src/web-components/demo/sketch-app-shell.demo.html
index 092ad7c..ef335ed 100644
--- a/loop/webui/src/web-components/demo/sketch-app-shell.demo.html
+++ b/loop/webui/src/web-components/demo/sketch-app-shell.demo.html
@@ -2,12 +2,14 @@
   <head>
     <title>sketch-app-shell demo</title>
     <link rel="stylesheet" href="demo.css" />
-    <script src="/dist/web-components/sketch-app-shell.js" type="module"></script>
+    <script
+      src="/dist/web-components/sketch-app-shell.js"
+      type="module"
+    ></script>
   </head>
   <body>
     <h1>sketch-app-shell demo</h1>
 
     <sketch-app-shell></sketch-app-shell>
-
   </body>
-</html>
\ No newline at end of file
+</html>