add zombie change bag in crate coupon

MrCCough

i would like to suggest that idea add zombie change bag in crate coupon. thats really helpful to zm players and zm4. for reason, because we are poor that we cannot buy functionality/vip characters who has zombie change bag perk. so i hope it good idea to add it in crate coupon.

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(edit: for future zm4, we may need it for impossible boss)

p.s: sorry for bad english :')