Update README.

Author: mbostock

README.md

@@ -16,7 +16,7 @@ To compute intermediate state, transitions leverage a variety of [built-in inter
 
 ## Installing
 
-If you use NPM, `npm install d3-transition`. Otherwise, download the [latest release](https://github.com/d3/d3-transition/releases/latest). You can also load directly from [d3js.org](https://d3js.org), either as a [standalone library](https://d3js.org/d3-transition.v1.min.js) or as part of [D3 4.0](https://github.com/d3/d3). AMD, CommonJS, and vanilla environments are supported. In vanilla, a `d3` global is exported:
+If you use NPM, `npm install d3-transition`. Otherwise, download the [latest release](https://github.com/d3/d3-transition/releases/latest). You can also load directly from [d3js.org](https://d3js.org), either as a [standalone library](https://d3js.org/d3-transition.v1.min.js) or as part of [D3](https://github.com/d3/d3). AMD, CommonJS, and vanilla environments are supported. In vanilla, a `d3` global is exported:
 
 ```html
 <script src="https://d3js.org/d3-color.v1.min.js"></script>