restore compatibility with regionmask v0.9.0

[mathause]

• Fixes test failure in refactor functions to 'predict' AR process #135
• Passes isort . && black . && flake8
• Fully documented, including CHANGELOG.rst

[mathause]

I don't get what is wrong here - almost looks like the code change is not picked up? I am confused.

[mathause]

And why is only one CI finishing?

[codecov-commenter]

Codecov Report

Merging #136 (ae63399) into master (459421d) will decrease coverage by 0.14%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
- Coverage   79.12%   78.97%   -0.15%     
==========================================
  Files          29       29              
  Lines        1341     1346       +5     
==========================================
+ Hits         1061     1063       +2     
- Misses        280      283       +3     

Flag	Coverage Δ
unittests	78.97% <55.55%> (-0.15%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mesmer/io/load_constant_files.py	93.10% <55.55%> (-3.24%)	⬇️

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[mathause]

Ok, found it...