Update CHANGELOG.md (#902)

Co-authored-by: ljosyula <ljosyula@amazon.com>

CHANGELOG.md

@@ -1,5 +1,38 @@
 # Changelog
 
+### AMI Release v20220420
+* amazon-eks-gpu-node-1.22-v20220420
+* amazon-eks-gpu-node-1.21-v20220420
+* amazon-eks-gpu-node-1.20-v20220420
+* amazon-eks-gpu-node-1.19-v20220420
+* amazon-eks-arm64-node-1.22-v20220420
+* amazon-eks-arm64-node-1.21-v20220420
+* amazon-eks-arm64-node-1.20-v20220420
+* amazon-eks-arm64-node-1.19-v20220420
+* amazon-eks-node-1.22-v20220420
+* amazon-eks-node-1.21-v20220420
+* amazon-eks-node-1.20-v20220420
+* amazon-eks-node-1.19-v20220420
+
+Binaries used to build these AMIs are published:
+* s3://amazon-eks/1.22.6/2022-03-09/
+* s3://amazon-eks/1.21.5/2021-11-10/
+* s3://amazon-eks/1.20.11/2021-11-10/
+* s3://amazon-eks/1.19.15/2021-11-10/
+
+AMI details:
+* kernel: 5.4.188-104.359.amzn2
+* dockerd: 20.10.13-2.amzn2
+* containerd: 1.4.13-2.amzn2.0.1
+* runc: 1.0.3-2.amzn2
+* cuda: 470.57.02-1
+* nvidia-container-runtime-hook: 1.4.0-1.amzn2
+* SSM agent: 3.1.1188.0
+
+Notable changes:
+- Patches for [CVE-2022-0778](https://nvd.nist.gov/vuln/detail/CVE-2022-0778), [CVE-2022-23218](https://nvd.nist.gov/vuln/detail/CVE-2022-23218) and [CVE-2022-23219](https://nvd.nist.gov/vuln/detail/CVE-2022-23219) have been included.
+- Deprecating 1.18 k8s Version
+
 ### AMI Release v20220406
 * amazon-eks-gpu-node-1.22-v20220406
 * amazon-eks-gpu-node-1.21-v20220406