Update link to glTF Blender addon.

docs/manual/en/introduction/Animation-system.html

@@ -36,7 +36,7 @@
 
 			If you have successfully imported an animated 3D object (it doesn't matter if it has
 			bones or morph targets or both) — for example exporting it from Blender with the
-			[link:https://github.com/KhronosGroup/glTF-Blender-Exporter glTF Blender exporter] and
+			[link:https://github.com/KhronosGroup/glTF-Blender-IO glTF Blender exporter] and
 			loading it into a three.js scene using [page:GLTFLoader] — one of the response fields
 			should be an array named "animations", containing the [page:AnimationClip AnimationClips]
 			for this model (see a list of possible loaders below).<br /><br />