Remove EncryptedFile no-created_at note from README

Author: Fivell

README.md

@@ -394,7 +394,7 @@ regions = client.regions().list(params).data
 The SDK distinguishes between date-only and datetime fields:
 
 - **Datetime fields** are deserialized as `datetime.datetime` with `timezone.utc`:
-  - All `created_at` fields — present on most resources (`EncryptedFile` has no `created_at`)
+  - All `created_at` fields — present on most resources
   - Expiry fields: `Did.expires_at`, `DidReservation.expire_at`, `Proof.expires_at`, `EncryptedFile.expire_at`
 - **Date-only fields** (`Identity.birth_date`, `CapacityPool.renew_date`, `DidOrderItem.billed_from`/`billed_to`) remain as `string` in `"YYYY-MM-DD"` format.