add `himself` to `pronounDictLowerCase`

sugarcube/src/npcs/_system/NPCsDict.js

@@ -6,6 +6,7 @@ let pronounDictLowerCase = {
     'he': ['he','she'],
     'him': ['him','her'],
     'his': ['his','her'],
+	'himself': ['himself','herself'],
 }
 
 let pronounDictUpperFirst = {};