Unpin dask

[aaronspring]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Closes #280

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Performance (if you touched existing code run asv to detect performance changes)
• refactoring

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. This could point to a cell in the updated notebooks. Or a snippet of code with accompanying figures here.

Checklist (while developing)

• I have added docstrings to all new functions.
• I have commented my code, particularly in hard-to-understand areas
• Tests added for pytest, if necessary.

Pre-Merge Checklist (final steps)

• I have rebased onto master or develop (wherever I am merging) and dealt with any conflicts.
• I have squashed commits to a reasonable amount, and force-pushed the squashed commits.

References

Please add any references to manuscripts, textbooks, etc.

[codecov-io]

Codecov Report

Merging #286 (4b270f2) into master (cdf9977) will decrease coverage by 0.60%.
The diff coverage is 95.60%.

@@            Coverage Diff             @@
##           master     #286      +/-   ##
==========================================
- Coverage   95.45%   94.85%   -0.61%     
==========================================
  Files          20       24       +4     
  Lines        1914     2681     +767     
==========================================
+ Hits         1827     2543     +716     
- Misses         87      138      +51     

Impacted Files	Coverage Δ
xskillscore/core/deterministic.py	97.54% <ø> (-2.46%)	⬇️
xskillscore/core/comparative.py	93.42% <88.23%> (-6.58%)	⬇️
xskillscore/tests/test_resampling.py	89.53% <89.53%> (ø)
xskillscore/core/utils.py	92.00% <90.24%> (+0.19%)	⬆️
xskillscore/core/probabilistic.py	91.79% <91.35%> (-1.19%)	⬇️
xskillscore/tests/test_probabilistic.py	96.50% <95.43%> (-3.50%)	⬇️
xskillscore/tests/conftest.py	98.70% <97.87%> (-1.30%)	⬇️
xskillscore/core/np_deterministic.py	99.17% <98.33%> (-0.36%)	⬇️
xskillscore/__init__.py	83.33% <100.00%> (ø)
xskillscore/core/accessor.py	100.00% <100.00%> (ø)
... and 17 more

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[raybellwaves]

https://pypi.org/project/dask/2021.3.1/

[raybellwaves]

Think it needs to be >= 2021.3.1. 2021.3 caused issues in xhistogram (xgcm/xhistogram#27). Could hang fire here until xhistogram puts out a new release (xgcm/xhistogram#40) or make that a separate PR.

[aaronspring]

!= means every version but that one. Worked before that version and will work after 2021.3.0. Please commit your preferred solution to this PR.

[raybellwaves]

Thanks @aaronspring