Suppress h5py FutureWarning

[mimischi]

Changes made in this Pull Request:

• Suppress the FutureWarning caused by h5py. See: FutureWarning: Conversion of the second argument of issubdtype from float to np.floating is deprecated h5py/h5py#961.

Replaces #34. Fixes #33.

PR Checklist

• CHANGELOG updated (added news fragment into changelog directory)?
• [ ] Issue raised/referenced?

[codecov]

Codecov Report

Merging #35 into master will increase coverage by 0.3%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #35     +/-   ##
=========================================
+ Coverage   66.56%   66.86%   +0.3%     
=========================================
  Files          10       10             
  Lines         326      329      +3     
=========================================
+ Hits          217      220      +3     
  Misses        109      109

Impacted Files	Coverage Δ
mdbenchmark/__init__.py	100% <100%> (ø)	⬆️

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