Touchdown

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- Add support for AWS Lambda security groups and subnets.

- Support propagating tags for autoscaling groups and removing tags from ASG's.

- Fix SSH on newer versions of ubuntu.

- You can now set `evaluate_target_health` on a route53 alias target.

- Support for an 'empty' serializer. Mostly when a field isn't set it shouldn't
have a value when serialized. CloudFront is an exception.

Touchdown now requires botocore 1.3.26 or higher.

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- Fix problems creating and copying AMI's

This release is tested with botocore 1.3.24.

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- Better diff rendering behaviour when a resource list has an item removed.

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- Fix typo in error message.

- Fix formatting error when diffing JSON payloads (such as for a `user_data`
attribute on a launch config). In this case the direction of the change could
be incorrect. (The actual change would be correct, however).

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- Don't try and delete launch configurations that are still in use.

- Better error messages when validating IAM certificate chains.

- Fix compatibility with progressbar2 >= 3.6.0. Previously it would work but
there were some formatting issues.

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- Support 'update by replacement' for IAM Server Certificates.

- Validates that an IAM Server Certificate `private_key` belongs to its
`certificate_body`.

- ELB attributes are now part of the load balancer object itself, so::

aws.add_load_balancer(
name="my-elb",
<snip>,
- attributes={
- "cross_zone_load_balancing": True,
- "connection_draining": 30,
- },
+ cross_zone_load_balancing=True,
+ connection_draining=30,
)