python-traittypes-0.2.1-bp155.2.10

- Disable xarray dependency and tests that require it on python2
  since xarray no longer supports python2.

- Exclude test_bad_values test while it is failing
  (gh#jupyter-widgets/traittypes#31)

- Update to 0.2.1
  * Add xarray DataArray
  * Remove unused imports (pandas and xarray)
  * Add xarray Dataset
  * Allow Undefined as default
  * Refactor commond pandas trait type (DRY)
  * Add tests for SciType validators
  * Only raise error for missing dependencies on use

- Initial version