change log updates

Author: NRHelmi

CHANGELOG.md

@@ -6,6 +6,10 @@
     - api.update_user
     - api.enable_user
     - fixed inputs for `exec_async`
+    - added `exec` and `exec_async` to run v2 transactions
+    - added `get_transaction` to get v2 transaction details
+    - added `get_transaction_metadata` to get v2 transaction metadata
+    - added `get_transaction_results_and_problems` to get v2 transaction results and problems
 
 ## v0.6.3