Suppress UserWarning caused by MDAnalysis 0.18

[mimischi]

Changes made in this pull request:

• Filter UserWarning caused by MDAnalysis 0.18

PR Checklist

• [ ] Added changelog fragment in ./changelog/ (more information)?
• [ ] Issue raised/referenced?

[mimischi]

Actually now that h5py==2.8 is released, their FutureWarning is gone. I think we should leave in that old filter, because users may not update to the newest h5py version and we do not want to force a minimal version in the package.

https://github.com/h5py/h5py/releases/tag/2.8.0

Thoughts? @kain88-de

[codecov]

Codecov Report

Merging #71 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   90.35%   90.37%   +0.01%     
==========================================
  Files          12       12              
  Lines         508      509       +1     
==========================================
+ Hits          459      460       +1     
  Misses         49       49

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

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