Unbreak building release artifacts!
- Upgrade to AWS SDK release (1.x) versions.
- Switch error handling to anyhow.
- Switch logging to tracing.
I'm treating the logging change, moving log level from a command line option to an environment variable, as a breaking change.
And, um, correct the broken download links in the README.
Add install, download & build into README.
Use cargo-dist to build and package release binaries.