Release v1.30.21 (2020-05-05)

service/ec2: Updates service API and documentation
- With this release, you can call ModifySubnetAttribute with two new parameters: MapCustomerOwnedIpOnLaunch and CustomerOwnedIpv4Pool, to map a customerOwnedIpv4Pool to a subnet. You will also see these two new fields in the DescribeSubnets response. If your subnet has a customerOwnedIpv4Pool mapped, your network interface will get an auto assigned customerOwnedIpv4 address when placed onto an instance.
service/ssm: Updates service API and documentation
- AWS Systems Manager Parameter Store launches new data type to support aliases in EC2 APIs
service/support: Updates service documentation
- Documentation updates for support

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