fix: Optimistic Update 코드 오류 수정 #37
Merged
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onMutate의 argument가 생략되어 있어 추가했습니다.사용자 경험(UX)을 올려주는 Optimistic Updates(낙관적 업데이트)
newHero를 받아오는 argument가 빠져 있어 수정하였습니다.