Add downlink for 21.1.5 release (#2179)

Signed-off-by: Karim TAAM <karim.t2am@gmail.com>

CHANGELOG.md

@@ -1,5 +1,19 @@
 # Changelog
 
+## 21.1.6
+
+### 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)
+
+
 ## 21.1.5
 
 ### Additions and Improvements
@@ -15,6 +29,14 @@
 
 #### 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)
+
+## Download Link
+https://hyperledger.jfrog.io/artifactory/besu-binaries/besu/21.1.5/besu-21.1.5.zip
+
+sha256: edd78fcc772cfa97d11d8ee7b5766e6fac4b31b582f940838a292f2aeb204777
+
 ## 21.1.4
 
 ### Additions and Improvements