Updated CHANGELOG

Author: Brian Vaughn

CHANGELOG.md

@@ -2,7 +2,8 @@ Changelog
 ------------
 
 ### Unreleased
-* 🎉 Imrpoved Flow types to include optional `itemData` parameter. ([TrySound](https://github.com/TrySound) - [#66](https://github.com/bvaughn/react-window/pull/66))
+* 🎉 Improved Flow types to include optional `itemData` parameter. ([TrySound](https://github.com/TrySound) - [#66](https://github.com/bvaughn/react-window/pull/66))
+* 🐛 `VariableSizeList` and `VariableSizeGrid` no longer call size getter functions with invalid index when item count is zero.
 
 ### 1.2.0
 * 🎉 Flow types added to NPM package. ([TrySound](https://github.com/TrySound) - [#40](https://github.com/bvaughn/react-window/pull/40))