Update CHANGELOG-v3.89.md

Author: zekeatchan

changelog/3.89/CHANGELOG-v3.89.md

@@ -17,6 +17,7 @@
 * * Particle emitter color RGB arrays are cleared before repopulating. Fix #7069 (thanks @Golen87 @samme)
 * `Phaser.Animations.AnimationFrame` correctly uses frame duration when it is set. Fix #7070 (thanks @sylvainpolletvillard)
 * Particle emitter custom `moveTo` functions can now move particles. Fix #7063 (thanks @samme)
+* Changed ImageCollections default Tileset values from `null` to `undefined`. Fix #7053 (thanks @Snoturky)
 
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