bug fix and update button

static/app.js

@@ -839,6 +839,16 @@ stopButton.addEventListener("click", () => {
     });
 });
 
+var updateButton = document.getElementById("update-btn");
+updateButton.addEventListener("click", () => {
+
+  fetch("/update", {
+      method: "POST",
+    });
+});
+
+
+
 var dispFormatButton = document.getElementById("dispformat-btn");
 
 var displayFormats = document.getElementById("inputDisplayFormat");