feat : Gender Enum 수정

Author: bumooo

core/src/main/java/com/mbtips/domain/virtualfriend/enums/Gender.java

@@ -1,6 +1,6 @@
 package com.mbtips.domain.virtualfriend.enums;
 
 public enum Gender {
-    MAIL,
+    MALE,
     FEMALE;
 }