[3.2] Add durable argument to atomic (#586)

* [3.2] Add durable argument to atomic

* Adjust compatibility table for 3.2

* Update README.md

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

tests/typecheck/test_helpers.yml

@@ -7,6 +7,8 @@
             pass
         with transaction.atomic(using="mydb", savepoint=False):
             pass
+        with transaction.atomic(using="mydb", savepoint=False, durable=True):
+            pass
 
 -   case: transaction_atomic_decorator
     main: |