Merge pull request #329 from Pseudo-Lab/cert/season-defalut

chore(cert): update default season

Author: soohyunme

cert/backend/config/default_periods.json

@@ -1,4 +1,6 @@
 {
+  "1": { "start": "2020-10-11", "end": "2020-12-19" },
+  "2": { "start": "2021-01-10", "end": "2021-03-27" },
   "3": { "start": "2021-07-16", "end": "2021-10-08" },
   "4": { "start": "2022-03-07", "end": "2022-05-29" },
   "5": { "start": "2022-09-05", "end": "2022-11-27" },