Merge pull request #81 from GoogleChrome/update-readme

Update sendToAnalytics() example

README.md

@@ -112,7 +112,7 @@ The `sendToAnalytics()` function uses the [`navigator.sendBeacon()`](https://dev
 import {getCLS, getFID, getLCP} from 'web-vitals';
 
 function sendToAnalytics(metric) {
-  const body = JSON.stringify(metric);
+  const body = JSON.stringify({[metric.name]: metric.value});
   // Use `navigator.sendBeacon()` if available, falling back to `fetch()`.
   (navigator.sendBeacon && navigator.sendBeacon('/analytics', body)) ||
       fetch('/analytics', {body, method: 'POST', keepalive: true});