Documentation: Always refer to the latest stable version.

Refs #1589
Closes gh-1849

docs/getting-started.md

@@ -32,10 +32,10 @@ To verify that the module is available, use `npm ls`:
 ```
 $ npm ls
 /home/ariya/demo
-└── esprima@3.1.3
+└── esprima@4.0.0
 ```
 
-The number after the `@` symbol, `3.1.3`, indicates the version of [Esprima package](https://www.npmjs.com/package/esprima) downloaded and installed from the package registry. This may vary from time to time, depending on the latest stable version available for everyone.
+The number after the `@` symbol, `4.0.0`, indicates the version of [Esprima package](https://www.npmjs.com/package/esprima) downloaded and installed from the package registry. This may vary from time to time, depending on the latest stable version available for everyone.
 
 To play with Esprima within Node.js, first launch Node.js. Inside its [REPL](https://en.wikipedia.org/wiki/REPL) command prompt, load the module using `require` and then use it, as illustrated in the following session:
 
@@ -69,7 +69,7 @@ To use Esprima in a library or an application designed to be used with Node.js,
 To use Esprima in a browser environment, it needs to be loaded using the `script` element. For instance, to load Esprima from a CDN such as [unpkg](https://unpkg.com/), the HTML document needs to have the following line:
 
 ```html
-<script src="https://unpkg.com/esprima@~3.1/dist/esprima.js"></script>
+<script src="https://unpkg.com/esprima@~4.0/dist/esprima.js"></script>
 ```
 
 When  Esprima is loaded this way, it will be available as a global object named `esprima`.