update CHANGES.md

CesiumGS · Jun 12, 2018 · a822e15 · a822e15
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@@ -6,6 +6,7 @@ Change Log
 ##### Additions :tada:
 * `PostProcessStage` has a `selectedFeatures` property which is an array of primitives used for selectively applying a post-process stage. In the fragment shader, use the function `bool czm_selected(vec2 textureCoordinates` to determine whether or not the stage should be applied at that fragment.
    * The black-and-white and silhouette stages have per-feature support.
+* Added `GroundPolylinePrimitive` and `GroundPolylineGeometry` for rendering polylines on terrain via the `Primitive` API. [#6615](https://github.com/AnalyticalGraphicsInc/cesium/pull/6615)
 
 ##### Fixes :wrench:
 * Fixed a bug causing crashes with custom vertex attributes on `Geometry` crossing the IDL. Attributes will be barycentrically interpolated. [#6644](https://github.com/AnalyticalGraphicsInc/cesium/pull/6644)