Add missing changelog entry

CHANGELOG.md

@@ -135,6 +135,7 @@
     Bug #5063: Shape named "Tri Shadow" in creature mesh is visible if it isn't hidden
     Bug #5067: Ranged attacks on unaware opponents ("critical hits") differ from the vanilla engine
     Bug #5069: Blocking creatures' attacks doesn't degrade shields
+    Bug #5073: NPCs open doors in front of them even if they don't have to
     Bug #5074: Paralyzed actors greet the player
     Bug #5075: Enchanting cast style can be changed if there's no object
     Bug #5078: DisablePlayerLooking is broken