Hotfix with PgGo implementation of SchemeCommenter.

Author: vvuwei

database/pg.go

@@ -96,7 +96,7 @@ func (db *PgGo) MakeTableComment(ctx context.Context, name string, comment strin
 	_, err := db.conn.ExecContext(ctx,
 		`COMMENT ON TABLE ? IS ?`,
 		pg.Safe(name),
-		pg.Safe(comment))
+		comment)
 
 	return err
 }
@@ -106,7 +106,7 @@ func (db *PgGo) MakeColumnComment(ctx context.Context, tableName string, columnN
 		`COMMENT ON COLUMN ?.? IS ?`,
 		pg.Safe(tableName),
 		pg.Safe(columnName),
-		pg.Safe(comment))
+		comment)
 
 	return err
 }