Update README

Author: mbostock

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## 0.6.0
 
-*Not yet released. These are forthcoming changes in the main branch.*
+[Released September 7, 2022.](https://github.com/observablehq/plot/releases/tag/v0.6.0)
 
 [<img src="./img/window-strict.png" width="640" height="398" alt="A smoothed line chart of Apple’s stock price">](https://observablehq.com/@observablehq/plot-window)
 

README.md

@@ -39,7 +39,7 @@ In vanilla HTML, Plot can be imported as an ES module, say from Skypack:
 ```html
 <script type="module">
 
-import * as Plot from "https://cdn.skypack.dev/@observablehq/plot@0.5";
+import * as Plot from "https://cdn.skypack.dev/@observablehq/plot@0.6";
 
 document.body.append(Plot.plot(options));
 
@@ -50,7 +50,7 @@ Plot is also available as a UMD bundle for legacy browsers.
 
 ```html
 <script src="https://cdn.jsdelivr.net/npm/d3@7"></script>
-<script src="https://cdn.jsdelivr.net/npm/@observablehq/plot@0.5"></script>
+<script src="https://cdn.jsdelivr.net/npm/@observablehq/plot@0.6"></script>
 <script>
 
 document.body.append(Plot.plot(options));