Add changelog

CHANGELOG.md

@@ -7,6 +7,7 @@
     Bug #3846: Strings starting with "-" fail to compile if not enclosed in quotes
     Bug #3905: Great House Dagoth issues
     Bug #4203: Resurrecting an actor should close the loot GUI
+    Bug #4700: Editor: Incorrect command implementation
     Bug #4744: Invisible particles must still be processed
     Bug #4752: UpdateCellCommand doesn't undo properly
     Bug #5100: Persuasion doesn't always clamp the resulting disposition