add promise queue

1-js/11-async/07-async-await/01-rewrite-async/task.md

@@ -0,0 +1,20 @@
+
+# Rewrite using async/await
+
+Rewrite the one of examples from the chapter <info:promise-chaining> using `async/await` instead of `.then/catch`:
+
+```js run
+function loadJson(url) {
+  return fetch(url)
+    .then(response => {
+      if (response.status == 200) {
+        return response.json();
+      } else {
+        throw new Error(response.status);
+      }
+    })
+}
+
+loadJson('no-such-user.json') // (3)
+  .catch(alert); // Error: 404
+```