Remove dependency DistributionsAD

[oschulz]

No description provided.

[oschulz]

Currently, tests can't run without DistributionsAD, will have to defer this.

[codecov-commenter]

Codecov Report

Merging #30 (78ada74) into master (89036ba) will not change coverage.
The diff coverage is n/a.

❗ Current head 78ada74 differs from pull request most recent head 50a1e1d. Consider uploading reports for the commit 50a1e1d to get more accurate results

@@           Coverage Diff           @@
##           master      #30   +/-   ##
=======================================
  Coverage   78.50%   78.50%           
=======================================
  Files           6        6           
  Lines         200      200           
=======================================
  Hits          157      157           
  Misses         43       43           

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