update history

History.md

@@ -7,6 +7,10 @@ This document maintains a list of changes to Slate with each new version. Until
 
 ### `0.6.0` — _July 22, 2016_
 
+- **Void components are no longer rendered implicity!** Previously, Slate would automatically wrap any node with `isVoid: true` in a `<Void>` component. But doing this prevented you from customizing the wrapper, like adding a `className` or `style` property. So you **must now render the wrapper yourself**, and it has been exported as `Slate.Void`.
+
+This, combined with a small change to the `<Void>` component's structure allows the "selected" state of void nodes to be rendered purely with CSS based on the `:focus` property of a `<Void>` element. This prevents us from having to handle this case specially when choosing whether to re-render or not when a new selection has occured, improving performance and reducing complexity.
+
 - **`data-offset-key` is now `<key>-<index>` instead of `<key>:<start>-<end>`.** This shouldn't actually affect anyone, unless you were specifically relying on that attribute in the DOM.
 
 This change greatly reduces the number of re-renders needed, since previously any additional characters would cause a cascading change in the `<start>` and `<end>` offsets of latter text ranges.