Add 3.1 upgrade notes

Drenso · Jun 11, 2024 · d4c7227 · d4c7227
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 This file describes the steps you will need to make when upgrading this bundle.
 
+# From 3.0 to 3.1
+
+  - The `iss`, `iat`, `nbf` and `exp` claims set in the access token are only validated when they are actually available. While this is strictly speaking not according to the JWT specification, we have decided to handle these cases gracefully.
+
 # From 2.0 to 3.0
 
   - ES signing algorithms are now supported