Optimize the library for webpack users (#1517)

* Add the `sideEffects: false` flag into the ES package.json

* Add a different Readme for async-es and link across the packages

* Fix the wrong method name

1 files changed, 59 insertions, 0 deletions

diff --git a/README.es.md b/README.es.md
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+![Async Logo](https://raw.githubusercontent.com/caolan/async/master/logo/async-logo_readme.jpg)
+
+[![Build Status via Travis CI](https://travis-ci.org/caolan/async.svg?branch=master)](https://travis-ci.org/caolan/async)
+[![NPM version](https://img.shields.io/npm/v/async.svg)](https://www.npmjs.com/package/async)
+[![Coverage Status](https://coveralls.io/repos/caolan/async/badge.svg?branch=master)](https://coveralls.io/r/caolan/async?branch=master)
+[![Join the chat at https://gitter.im/caolan/async](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/caolan/async?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![libhive - Open source examples](https://www.libhive.com/providers/npm/packages/async/examples/badge.svg)](https://www.libhive.com/providers/npm/packages/async)
+[![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/async/badge?style=rounded)](https://www.jsdelivr.com/package/npm/async)
+
+
+Async is a utility module which provides straight-forward, powerful functions for working with [asynchronous JavaScript](http://caolan.github.io/async/global.html). Although originally designed for use with [Node.js](https://nodejs.org/) and installable via `npm install --save async`, it can also be used directly in the browser.
+
+This version of the package is optimized for building with webpack. If you use Async in Node.js, install [`async`](https://www.npmjs.com/package/async) instead.
+
+For Documentation, visit <https://caolan.github.io/async/>
+
+*For Async v1.5.x documentation, go [HERE](https://github.com/caolan/async/blob/v1.5.2/README.md)*
+
+
+```javascript
+// for use with callbacks...
+import { forEachOf } from "async-es";
+
+const images = {cat: "/cat.png", dog: "/dog.png", duck: "/duck.png"};
+const sizes = {};
+
+forEachOf(images, (value, key, callback) => {
+    const imageElem = new Image();
+    imageElem.src = value;
+    imageElem.addEventListener("load", () => {
+        sizes[key] = {
+            width: imageElem.naturalWidth,
+            height: imageElem.naturalHeight,
+        };
+        callback();
+    });
+    imageElem.addEventListener("error", (e) => {
+        callback(e);
+    });
+}, err => {
+    if (err) console.error(err.message);
+    // `sizes` is now a map of image sizes
+    doSomethingWith(sizes);
+});
+```
+
+```javascript
+import { mapLimit } from "async-es";
+
+// ...or ES2017 async functions
+mapLimit(urls, 5, async function(url) {
+    const response = await fetch(url)
+    return response.body
+}, (err, results) => {
+    if (err) throw err
+    // results is now an array of the response bodies
+    console.log(results)
+})
+```