1.3.0

Move installing the main loop signal handling logic to just before executing the command so we keep the default signal handling mechanics for the rest of the program.

Build a user interface around the built-in EC2 metadata service credential endpoint.

The EC2 metadata service credential feature now comes with a frontend to allow you to switch roles via
your web browser. Run aws-runas --ec2 to get started and point your browser at http://169.254.169.254/ to select a profile name to use for credentials.

The service can also be directly managed via http endpoints on the service. More info can be found in the documentation

Signed executables for Windows will also be provided from this point forward, in addition to the unsigned versions.