implemented anderson darling test

[DanielLacina]

No description provided.

[YeungOnion]

Hi there, thanks for the contribution!

But for the one spot I commented, it all looks good to me. Feel free to ask any other questions.

[DanielLacina]

@YeungOnion I resolved the issue.

[codecov]

Codecov Report

Attention: Patch coverage is 92.20779% with 6 lines in your changes missing coverage. Please review.

Project coverage is 94.99%. Comparing base (526e85e) to head (5a26c15).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/stats_tests/anderson_darling.rs	92.20%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #346      +/-   ##
==========================================
- Coverage   95.01%   94.99%   -0.02%     
==========================================
  Files          60       61       +1     
  Lines       13529    13606      +77     
==========================================
+ Hits        12854    12925      +71     
- Misses        675      681       +6     

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[DanielLacina]

I fixed the formatting and added one test to coverage more code.

[YeungOnion]

The clippy error isn't on you, thanks for this!