Add known issues to latest releases in changelog. (#1637)

Signed-off-by: Tim Beiko <t.beiko23@gmail.com>

CHANGELOG.md

@@ -13,6 +13,12 @@
 * EvmTool now throws `UnsupportedForkException` when there is an unknown fork and is YOLOv2 compatible [\#1584](https://github.com/hyperledger/besu/pull/1584)
 * `eth_newFilter` now supports `blockHash` parameter as per the spec [\#1548](https://github.com/hyperledger/besu/issues/1540). (`blockhash` is also still supported.)
 
+#### Previously identified known issues
+
+- [Eth/65 loses peers](KNOWN_ISSUES.md#eth65-loses-peers)
+- [Fast sync when running Besu on cloud providers](KNOWN_ISSUES.md#fast-sync-when-running-besu-on-cloud-providers)
+- [Privacy users with private transactions created using v1.3.4 or earlier](KNOWN_ISSUES.md#privacy-users-with-private-transactions-created-using-v134-or-earlier)
+
 ## 20.10.1
 
 ### Additions and Improvements
@@ -47,6 +53,12 @@ Deprecated in 1.5.1
 
 The [Besu Sample Networks repository](https://github.com/ConsenSys/besu-sample-networks) has been replaced by the [Quorum Developer Quickstart](https://besu.hyperledger.org/en/latest/Tutorials/Developer-Quickstart). 
 
+#### Previously identified known issues
+
+- [Eth/65 loses peers](KNOWN_ISSUES.md#eth65-loses-peers)
+- [Fast sync when running Besu on cloud providers](KNOWN_ISSUES.md#fast-sync-when-running-besu-on-cloud-providers)
+- [Privacy users with private transactions created using v1.3.4 or earlier](KNOWN_ISSUES.md#privacy-users-with-private-transactions-created-using-v134-or-earlier)
+
 ### Download Link
 
 https://dl.bintray.com/hyperledger-org/besu-repo/besu-20.10.1.zip