v4 launch details (#472)

* fixed review

Signed-off-by: Matteo Collina <hello@matteocollina.com>

* Update README.md

Co-authored-by: Vincent Weevers <mail@vincentweevers.nl>

* Update README.md

Co-authored-by: Vincent Weevers <mail@vincentweevers.nl>

Co-authored-by: Vincent Weevers <mail@vincentweevers.nl>

README.md

@@ -8,7 +8,7 @@
 [![Browsers Build](https://github.com/nodejs/readable-stream/workflows/Browsers/badge.svg)](https://github.com/nodejs/readable-stream/actions?query=workflow%3ABrowsers)
 
 ```bash
-npm install --save readable-stream
+npm install readable-stream
 ```
 
 This package is a mirror of the streams implementations in Node.js 18.0.0.
@@ -20,6 +20,20 @@ Node you, or the users of your libraries are using, use **readable-stream** _onl
 
 As of version 2.0.0 **readable-stream** uses semantic versioning.
 
+## Version 4.x.x
+
+v4.x.x of `readable-stream` is a cut from Node 18. This version supports Node 12, 14, 16 and 18, as well as evergreen browsers.
+The breaking changes introduced by v4 are composed of the combined breaking changes in:
+* [Node v12](https://nodejs.org/en/blog/release/v12.0.0/)
+* [Node v13](https://nodejs.org/en/blog/release/v13.0.0/)
+* [Node v14](https://nodejs.org/en/blog/release/v14.0.0/)
+* [Node v15](https://nodejs.org/en/blog/release/v15.0.0/)
+* [Node v16](https://nodejs.org/en/blog/release/v16.0.0/)
+* [Node v17](https://nodejs.org/en/blog/release/v17.0.0/)
+* [Node v18](https://nodejs.org/en/blog/release/v18.0.0/)
+
+This also includes _many_ new features.
+
 ## Version 3.x.x
 
 v3.x.x of `readable-stream` is a cut from Node 10. This version supports Node 6, 8, and 10, as well as evergreen browsers, IE 11 and latest Safari. The breaking changes introduced by v3 are composed by the combined breaking changes in [Node v9](https://nodejs.org/en/blog/release/v9.0.0/) and [Node v10](https://nodejs.org/en/blog/release/v10.0.0/), as follows:
@@ -56,7 +70,14 @@ without any changes, if you are just using one of the main classes and
 functions.
 
 ```js
-const { Readable, Writable, Transform, Duplex, pipeline, finished } = require('readable-stream')
+const {
+  Readable,
+  Writable,
+  Transform,
+  Duplex,
+  pipeline,
+  finished
+} = require('readable-stream')
 ```
 
 Note that `require('stream')` will return `Stream`, while