3.2.1

• Catch exceptions in the custom resource background thread. Retry up to ten times for Kubernetes exceptions, and crash the entire process on unknown exceptions or more than ten consecutive Kubernetes failures. This prevents a problem where the token update pod continues running and appears to be healthy, but the watcher thread has crashed so it's doing nothing.
• Switch to aioredis 2.0. Unfortuantely, this breaks mockaioredis, so only the Docker tests (which use a real Redis server) can be run for the time being.
• Update dependencies.