Change distance threshold

@@ -137,7 +137,7 @@ async def thread(websocket, path):
 
                 # 출석 데이터 전송
                 send = ''
-                if distance_min < 0.65:
+                if distance_min < 0.62:
                     # 인증 성공
                     # 오늘 이미 출석 됐는지 확인
                     sql = "SELECT DATE(timestamp) FROM student_attendance WHERE (lecture_id=%s) AND (student_id=%s) AND (DATE(timestamp) = CURDATE());"