Aws-mfa-v2

This is another patch release containing a new feature to support the region configuration option as well as some dependency version updates.

This is a patch release containing a bug fix (thanks Szasza) to use the correct STS client instance when the force refresh flag is used. It also contains a couple dependency updates.

- Improve formatting of time remaining

- Added --min-remaining flag which is basicly a pre-emptive credential refresh. In some situations (ie when used with terraform apply) it may be convenient to be able to ensure credentials are good for at least N seconds in the future. This way we don't end up with a partially complete terraform apply operation and abandoned locks when our credentials expire mid apply.
- Migrated to Poetry
- Migrated to Python 3.8+
- Updated deps

- Support newer versions of ykman
- Update README.md to include release process

Changes in this release:
* PR merged from Michenux https://github.com/rkeiii/aws-mfa-v2/pull/3 adding option to override the name of the AWS credentials within the profile
* Black code formatting applied