update CHANGES.md
update CHANGES.md

likangning93/cesium,likangning93/cesium,CesiumGS/cesium,CesiumGS/cesium,CesiumGS/cesium,likangning93/cesium,progsung/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,CesiumGS/cesium,progsung/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,CesiumGS/cesium