update CHANGES

Author: shunter

CHANGES.md

@@ -14,6 +14,9 @@ Change Log
   * Added support for Internet Explorer.
   * Added a `ClippingPlane` object to be used with `ClippingPlaneCollection`.
 * Updated `WebMapServiceImageryProvider` so it can take an srs or crs string to pass to the resource query parameters based on the WMS version. [#6223](https://github.com/AnalyticalGraphicsInc/cesium/issues/6223)
+* Added additional query parameter options to the CesiumViewer demo application:
+  * sourceType specifies the type of data source if the URL doesn't have a known file extension.
+  * flyTo=false optionally disables the automatic flyTo after loading the data source.
 * Added a multi-part CZML example to Sandcastle. [#6320](https://github.com/AnalyticalGraphicsInc/cesium/pull/6320)
 
 ##### Fixes :wrench: