added time check for cordex

[cehbrecht]

Pull Request Checklist:

• [x] This PR addresses an already opened issue (for bug fixes / features)

  • This PR is related to issue #201

• [x] Tests for the changes have been added (for bug fixes / features)

• [ ] Documentation has been added / updated (for bug fixes / features)

• [ ] HISTORY.rst has been updated (with summary of main changes)

• [x] I have added my relevant user information to AUTHORS.md

• What kind of change does this PR introduce?:

Extends cordex tests for time coverage.

• Does this PR introduce a breaking change?:

no

• Other information:

[agstephens]

Hi @cehbrecht , I just re-ran the tests on this PR. It got further but failed on the conda-xesmf tests. Does it all run fine on your local installation?

[cehbrecht]

@agstephens re-based with current master. Tests are working again :) I will merge.