Update requirements and add update script

requirements.txt

@@ -1,3 +1,4 @@
+feedparser
 aiogram==2.3
 aiohttp==3.6.0
 arrow==0.11.0

update.py

@@ -0,0 +1,9 @@
+import shelve
+from EDTuser import User
+
+with shelve.open("edt", writeback=True) as db:
+    for u in db:
+        nu = User(0, None)
+        for v in db[u].__dict__:
+            setattr(nu, v, db[u].__dict__[v])
+        db[u] = nu