README: Note that Punycode.js won’t ship with Node.js forever

Ref. nodejs/node#7941.

README.md

@@ -10,16 +10,16 @@ This JavaScript library is the result of comparing, optimizing and documenting d
 * [JavaScript implementation by _some_](http://stackoverflow.com/questions/183485/can-anyone-recommend-a-good-free-javascript-for-punycode-to-unicode-conversion/301287#301287)
 * [`punycode.js` by _Ben Noordhuis_](https://github.com/joyent/node/blob/426298c8c1c0d5b5224ac3658c41e7c2a3fe9377/lib/punycode.js) (note: [not fully compliant](https://github.com/joyent/node/issues/2072))
 
-This project is [bundled](https://github.com/joyent/node/blob/master/lib/punycode.js) with [Node.js v0.6.2+](https://github.com/joyent/node/compare/975f1930b1...61e796decc) and [io.js v1.0.0+](https://github.com/iojs/io.js/blob/v1.x/lib/punycode.js).
+This project was [bundled](https://github.com/joyent/node/blob/master/lib/punycode.js) with Node.js from [v0.6.2+](https://github.com/joyent/node/compare/975f1930b1...61e796decc) until [v7](https://github.com/nodejs/node/pull/7941) (soft-deprecated).
 
 The current version supports recent versions of Node.js only. For the old version that offers the same functionality with broader support, including Rhino, Ringo, Narwhal, and web browsers, see [v1.4.1](https://github.com/bestiejs/punycode.js/releases/tag/v1.4.1).
 
 ## Installation
 
-Via [npm](https://www.npmjs.com/) (only required for Node.js releases older than v0.6.2):
+Via [npm](https://www.npmjs.com/):
 
 ```bash
-npm install punycode
+npm install punycode --save
 ```
 
 In [Node.js](https://nodejs.org/):