Remove deprecated internal ZstdCompressor constructor

[nhz2]

Redo of #84

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.49%. Comparing base (1c13659) to head (4c4e73e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #86      +/-   ##
==========================================
+ Coverage   60.98%   61.49%   +0.50%     
==========================================
  Files           4        4              
  Lines         364      361       -3     
==========================================
  Hits          222      222              
+ Misses        142      139       -3     

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