Added changelog entries for PR: (#459)

- https://github.com/hyperledger/besu/pull/430
- https://github.com/hyperledger/besu/pull/440

Signed-off-by: Abdelhamid Bakhta <abdelhamid.bakhta@consensys.net>

CHANGELOG.md

@@ -2,12 +2,13 @@
 
 ## 1.4.1
 - Added priv_getCode [\#250](https://github.com/hyperledger/besu/pull/408). Gets the bytecode associated with a private address.
-
+- Added database migration acceptance tests [\#430](https://github.com/hyperledger/besu/pull/430) .
+- Removed -X unstable prefix for pruning options (`--pruning-blocks-retained`, `--pruning-block-confirmations`) [\#440](https://github.com/hyperledger/besu/pull/440).
 ### Bug Fixes
 
 - [BESU-25](https://jira.hyperledger.org/browse/BESU-25) Use v5 Devp2p when pinging [\#392](https://github.com/hyperledger/besu/pull/392)
 - Specifying RPC credentials file should not force RPC Authentication to be enabled [\#454](https://github.com/hyperledger/besu/pull/454) 
-
+- Fixed configuration file bug: `pruning-blocks-retained` now accepts an integer in the config [\#440](https://github.com/hyperledger/besu/pull/440).
 
 ## 1.4.0