Update CHANGES to make underground visualization more prominent
Update CHANGES to make underground visualization more prominent

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