[core] Update changelog

mapbox · Feb 14, 2020 · ce9e0e0 · ce9e0e0
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 - [core] Fix potential visual artifact for line-dasharray ([#16202](https://github.com/mapbox/mapbox-gl-native/pull/16202))
 
+- Store gfx::DrawScope objects with associated render objects. ([#15395](https://github.com/mapbox/mapbox-gl-native/pull/15395))
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+  We used some shared SegmentVectors, e.g. for drawing raster or background tiles. In longer running maps, this lead to resource accumulation. By storing the SegmentVectors and the contained gfx::DrawScope objects, we ensure that resources get released when the associated render objects vanish.
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 ### 🏁 Performance improvements
 
  - [core] Loading images to style optimization ([#16187](https://github.com/mapbox/mapbox-gl-native/pull/16187))