refactor classes, add private, minor fixes

1-js/11-async/02-promise-basics/01-re-resolve/task.md

@@ -0,0 +1,15 @@
+
+# Re-resolve a promise?
+
+
+What's the output of the code below? 
+
+```js
+let promise = new Promise(function(resolve, reject) {
+  resolve(1);
+
+  setTimeout(() => resolve(2), 1000);
+});
+
+promise.then(alert);
+```