Merge pull request #267 from boocam-project/hotfix

[fix] DDL 수정

src/main/resources/db/migration/V30__Add_studyComment_table.sql

@@ -3,6 +3,7 @@ CREATE TABLE study_comment
     id                       BIGINT AUTO_INCREMENT NOT NULL,
     created_at               DATETIME              NULL,
     updated_at               DATETIME              NULL,
+    deleted_at               DATETIME              NULL,
     study_id                 BIGINT                NOT NULL,
     member_id                BIGINT                NOT NULL,
     content                  VARCHAR(255)          NOT NULL,