feat: handles inspection of objects with circular references

[pcorpet]

Fix #44

[keithamus]

This all looks good but maybe a Set is a better choice here?

[pcorpet]

I thought that not all environment that loupe supported had a Set, so I used a simple array. Note that this is the implementation that was used in the chaijs/chai inspect function

[codecov]

Codecov Report

Merging #47 (bdcc1af) into master (5db74c7) will increase coverage by 0.30%.
The diff coverage is 100.00%.

❗ Current head bdcc1af differs from pull request most recent head 26cc144. Consider uploading reports for the commit 26cc144 to get more accurate results

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
+ Coverage   73.54%   73.84%   +0.30%     
==========================================
  Files          19       19              
  Lines         601      608       +7     
==========================================
+ Hits          442      449       +7     
  Misses        159      159              

Impacted Files	Coverage Δ
lib/object.js	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 2.2.0 🎉

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