changelog: Windows entries
## Unreleased
* Feature - Support pulling from Amazon ECR with specified IAM role in task definition
* Feature - Enable support for task level CPU and memory constraints.
+* Feature - Enable the ECS agent to run as a Windows service. [#1070](https://github.com/aws/amazon-ecs-agent/pull/1070)
+* Enhancement - Support CloudWatch metrics for Windows. [#1077](https://github.com/aws/amazon-ecs-agent/pull/1077)
+* Enhancement - Enforce memory limits on Windows. [#1069](https://github.com/aws/amazon-ecs-agent/pull/1069)
+* Enhancement - Enforce CPU limits on Windows. [#1089](https://github.com/aws/amazon-ecs-agent/pull/1089)
+* Enhancement - Simplify task IAM credential host setup. [#1105](https://github.com/aws/amazon-ecs-agent/pull/1105)
## 1.15.2
* Bug - Fixed a bug where container state information wasn't reported. [#1076](https://github.com/aws/amazon-ecs-agent/pull/1076)
