Start Bi-infinite ranges

[dlfivefifty]

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[codecov]

Codecov Report

❌ Patch coverage is 92.50000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.02%. Comparing base (8dfbaf6) to head (40042ee).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/biinfrange.jl	92.40%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
+ Coverage   89.31%   90.02%   +0.70%     
==========================================
  Files          10       11       +1     
  Lines        1142     1303     +161     
==========================================
+ Hits         1020     1173     +153     
- Misses        122      130       +8     

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