add min/maximum(abs)

[aplavin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 94.84%. Comparing base (13c76e1) to head (37e0c1a).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
src/IntervalSets.jl	62.50%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #196      +/-   ##
==========================================
- Coverage   99.11%   94.84%   -4.27%     
==========================================
  Files           6        6              
  Lines         225      291      +66     
==========================================
+ Hits          223      276      +53     
- Misses          2       15      +13     

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