update changelog (#2309)

Signed-off-by: Ratan Rai Sur <ratan.r.sur@gmail.com>

CHANGELOG.md

@@ -1,11 +1,24 @@
 # Changelog
 
+## 21.1.7
+
+### Additions and Improvements
+
+### Bug Fixes
+
+### Early Access Features
+
+#### Previously identified known issues
+
+- Fixed issue in discv5 where nonce was incorrectly reused. [\#2075](https://github.com/hyperledger/besu/pull/2075)
+- Fixed issues in debug_standardTraceBadBlockToFile and debug_standardTraceBlockToFile. [\#2120](https://github.com/hyperledger/besu/pull/2120)
+- Fixed invalid error code in several JSON RPC methods when the requested block is not in the range. [\#2138](https://github.com/hyperledger/besu/pull/2138)
+
 ## 21.1.6
 
 ### Additions and Improvements
 
 * Added support for the upcoming BAIKAL ephemeral testnet and removed the configuration for the deprecated YOLOv3 ephemeral testnet. [\#2237](https://github.com/hyperledger/besu/pull/2237)
-* Added support for the London Network Upgrade, although the block number must be set manually with `--override-genesis-config=londonBlock=<blocknumber>`. This is because the block numbers haven't been determined yet. The next release will include the number in the genesis file so it will support London with no intervention. [\#2237](https://github.com/hyperledger/besu/pull/2237)
 * Implemented [EIP-3541](https://eips.ethereum.org/EIPS/eip-3541): Reject new contracts starting with the 0xEF byte [\#2243](https://github.com/hyperledger/besu/pull/2243)
 * Implemented [EIP-3529](https://eips.ethereum.org/EIPS/eip-3529): Reduction in refunds [\#2238](https://github.com/hyperledger/besu/pull/2238)
 * Implemented [EIP-3554](https://eips.ethereum.org/EIPS/eip-3554): Difficulty Bomb Delay [\#2289](https://github.com/hyperledger/besu/pull/2289)
@@ -25,6 +38,11 @@
 - Fixed issues in debug_standardTraceBadBlockToFile and debug_standardTraceBlockToFile. [\#2120](https://github.com/hyperledger/besu/pull/2120)
 - Fixed invalid error code in several JSON RPC methods when the requested block is not in the range. [\#2138](https://github.com/hyperledger/besu/pull/2138)
 
+## Download Link
+https://hyperledger.jfrog.io/artifactory/besu-binaries/besu/21.1.6/besu-21.1.6.zip
+
+sha256: 3952c69a32bb390ec84ccf4c2c3eb600ea3696af9a05914985d10e1632ef8488
+
 ## 21.1.5
 
 ### Additions and Improvements