use __name__ == "__main__" for the MPIPoolExecutor

[basnijholt]

Description

Currently, the example is incorrect.

Checklist

• Fixed style issues using pre-commit run --all (first install using pip install pre-commit)
• pytest passed

Type of change

Check relevant option(s).

• 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)
• This change requires a documentation update

[codecov-io]

Codecov Report

Merging #260 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #260      +/-   ##
==========================================
- Coverage   79.52%   79.50%   -0.03%     
==========================================
  Files          32       32              
  Lines        4401     4401              
  Branches      810      810              
==========================================
- Hits         3500     3499       -1     
  Misses        776      776              
- Partials      125      126       +1     

Impacted Files	Coverage Δ
adaptive/learner/learner2D.py	78.02% <0.00%> (-0.37%)	⬇️

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[akhmerov]

Thanks!