Update CHANGELOG-v3.50.md

Author: photonstorm

CHANGELOG-v3.50.md

@@ -675,6 +675,7 @@ Since v3.0.0 the Game Object `render` functions have received a parameter called
 * `WebGLRenderer.vaoExtension` is a new property that holds a reference to the Vertex Array Object WebGL Extension, if supported by the browser.
 * `CameraManager.getVisibleChildren` is a new method that is called internally by the `CameraManager.render` method. It filters the DisplayList, so that Game Objects that pass the `willRender` test for the given Camera are added to a sub-list, which is then passed to the renderer. This avoids the renderer having to do any checks on the children, it just renders each one in turn.
 * `Physics.Arcade.Body.setDamping` is a new method that allows you to set the `useDamping` property of a Body in a chainable way. Fix #5352 (thanks @juanitogan)
+* The `GameObjects.Graphics.fillGradientStyle` method can now accept a different alpha value for each of the fill colors. The default is still 1. If you only provide a single alpha, it'll be used for all colors. Fix #5044 (thanks @zhangciwu)
 
 ### Updates and API Changes