Docs update.

Author: photonstorm

README.md

@@ -332,6 +332,7 @@ You can read all about the philosophy behind Lazer [here](http://phaser.io/news/
 * Stage will now check if `document.hidden` is available first, and if it is then never even check for the prefixed versions. This stops warnings like "mozHidden and mozVisibilityState are deprecated" in newer versions of browsers and retain backward compatibility (thanks @leopoldobrines7 #2656)
 * As a result of changes in #2573 Graphics objects were calling `updateLocalBounds` on any shape change, which could cause dramatic performances drops in Graphics heavy situations (#2618). Graphics objects now have a new flag `_boundsDirty` which is used to detect if the bounds have been invalidated, i.e. by a Graphics being cleared or drawn to. If this is set to true then `updateLocalBounds` is called once in the `postUpdate` method (thanks @pengchuan #2618)
 * Phaser.Image now has the ScaleMinMax component.
+* Animations now allow for speeds greater than 0, rather than forcing them to be greater than 1. This allows you to have animation speeds slower than 1 frame per second (thanks @jayrobin #2664)
 
 ### Bug Fixes