Update docs to include childComponent.

Author: marnusw

README.md

@@ -15,7 +15,7 @@ Using `react-css-transition-replace` provides two distinct benefits:
 
 Animations are fully configurable with CSS, including having the entering component wait to enter until 
 the leaving component's animation completes. Following suit with the 
-[React.js API](https://facebook.github.io/react/docs/animation.html#getting-started) the one caveat is 
+[React.js API](https://facebook.github.io/react/docs/animation.html) the one caveat is 
 that the transition duration must be specified in JavaScript as well as CSS.
 
 [Live Examples](http://marnusw.github.io/react-css-transition-replace) | 
@@ -56,6 +56,10 @@ It is also possible to remove the child component (i.e. leave `ReactCSSTransitio
 which will animate the `height` going to zero along with the `leave` transition. Similarly, a single child 
 can be added to an empty `ReactCSSTransitionReplace`, triggering the inverse animation.
 
+By default a `span` is rendered as a wrapper of the child components. Each child is also wrapped in a `span`
+used in the positioning of the actual rendered child. These can be overridden with the `component` and 
+`childComponent` props respectively.
+
 ### Cross-fading two components
 
 The `ReactCSSTransitionReplace` component is used exactly like its `ReactCSSTransitionGroup` counterpart:

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-css-transition-replace",
-  "version": "2.2.0",
+  "version": "3.0.0-beta.1",
   "description": "A React component to animate replacing one element with another.",
   "main": "lib/ReactCSSTransitionReplace.js",
   "repository": {