Add #5207 to the changelog

CHANGELOG.md

@@ -13,6 +13,7 @@
     Bug #4744: Invisible particles must still be processed
     Bug #5100: Persuasion doesn't always clamp the resulting disposition
     Bug #5120: Scripted object spawning updates physics system
+    Bug #5207: Loose summons can be present in scene
     Bug #5379: Wandering NPCs falling through cantons
     Bug #5453: Magic effect VFX are offset for creatures
     Bug #5483: AutoCalc flag is not used to calculate spells cost