Use greater than or equal to in resample check

[lboeman]

• [x] Closes #723 .
• [x] I am familiar with the contributing guidelines.
• [x] Tests added.
• [ ] Updates entries to docs/source/api.rst for API changes.
• [x] Adds descriptions to appropriate "what's new" file in docs/source/whatsnew for all changes. Includes link to the GitHub Issue with :issue:`num` or this Pull Request with :pull:`num`. Includes contributor name and/or GitHub username (link with :ghuser:`user`).
• [x] New code is fully documented. Includes numpydoc compliant docstrings, examples, and comments where necessary.
• [x] Maintainer: Appropriate GitHub Labels and Milestone are assigned to the Pull Request and linked Issue.

[lboeman]

I added a few more tests to explicitly check the changes made here and reverted the changed test that you commented on. It's hanging up on the dev api tests still but new tests are passing.