update death

src/classes/death_reason.py

@@ -0,0 +1,11 @@
+from enum import Enum
+
+class DeathReason(Enum):
+    OLD_AGE = "老死"
+    BATTLE = "战死"
+    SERIOUS_INJURY = "重伤"
+    UNKNOWN = "未知"
+
+    def __str__(self) -> str:
+        return self.value
+