Merge pull request #262 from Gongjakso/fix/contest

fix : contest update 시 body 문자열 변환

src/main/java/com/gongjakso/server/domain/contest/entity/Contest.java

@@ -42,7 +42,7 @@ public class Contest extends BaseTimeEntity {
 
     public void update(UpdateContestDto contest,String imgUrl){
         this.title= (contest.title()==null) ? this.title : contest.title();
-        this.body= (contest.body()==null) ? this.body : contest.body();
+        this.body= (contest.body()==null) ? this.body :  contest.body().replace("\n","<br/>").replace("\t","<t/>");;
         this.contestLink= (contest.contestLink()==null) ? this.contestLink : contest.contestLink();
         this.institution= (contest.institution()==null) ? this.institution : contest.institution();
         this.startedAt= (contest.startedAt()==null) ? this.startedAt : contest.startedAt();