Update changelog with NR fix

changelog.md

@@ -131,6 +131,7 @@
      * Rebalanced gold values in all scenarios
    * Northern Rebirth:
      * Eryssa now must survive if she joins the player
+     * Father Morvin and Sister Thera will now respawn at Tallin's location if they die to prevent illogical gameplay
      * S4: Have Hamel describe Ghouls if Camerin is dead
      * S5: Add gates to map instead of images and overlays
      * S8: add text and updated objectives when rescuing Eryssa