update compat

[nignatiadis]

Hi!

The main purpose of this pull request is to update the StatsBase compat (currently it is not possible to simultaneously install Discretizers and the latest StatsBase.

I also added a compat entry for Statistics, as per https://discourse.julialang.org/t/psa-compat-requirements-in-the-general-registry-are-changing/104958.

Thanks!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (600faf0) 94.06% compared to head (28c1dee) 94.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
+ Coverage   94.06%   94.28%   +0.22%     
==========================================
  Files          10       11       +1     
  Lines         893      945      +52     
==========================================
+ Hits          840      891      +51     
- Misses         53       54       +1     

Flag	Coverage Δ
unittests	94.28% <ø> (+0.22%)	⬆️

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see 8 files with indirect coverage changes

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