Koozie

Update to pint v0.21. Resolves issue related to dimensionless units.

**Full Changelog**: https://github.com/bigladder/koozie/compare/v1.2.2...v1.2.3

- Fix support for other numeric types (e.g., numpy float)

**Full Changelog**: https://github.com/bigladder/koozie/compare/v1.2.1...v1.2.2

- Fixes issue when converting integer values.

**Full Changelog**: https://github.com/bigladder/koozie/compare/v1.2.0...v1.2.1

- Adds ability to convert iterable containers of values.
- Adds function to get the dimensionality of units
- Behind-the-scenes code clean up

**Full Changelog**: https://github.com/bigladder/koozie/compare/v1.1.0...v1.2.0

Add command line interface utility.

**Full Changelog**: https://github.com/bigladder/koozie/compare/v1.0.0...v1.1.0

Initial release.