Update events RELEASE.CHANGELOG.md (aws#134)

Author: bmoffatt

aws-lambda-java-events/RELEASE.CHANGELOG.md

@@ -2,6 +2,10 @@
 - Added support for Application Load Balancer Target Events ([#131](https://github.com/aws/aws-lambda-java-libs/pull/131))
   - `ApplicationLoadBalancerRequestEvent`
   - `ApplicationLoadBalancerResponseEvent`
+- Added support for API Gateway HTTP API Events ([#123](https://github.com/aws/aws-lambda-java-libs/pull/123))
+  - `APIGatewayV2HTTPEvent`
+  - `APIGatewayV2HTTPResponse`
+- Aliased the existing APIGatewayV2Proxy classes as `APIGatewayV2WebSocketEvent`/`APIGatewayV2WebSocketResponse` ([#125](https://github.com/aws/aws-lambda-java-libs/pull/125))
 
 ### May 18, 2020
 `3.0.0`: