Introduce log feature

[dr-orlovsky]

Closes #101

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 31.2%. Comparing base (1d24b92) to head (09d5507).

Files	Patch %	Lines
src/library/lib.rs	0.0%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #106   +/-   ##
======================================
  Coverage    31.2%   31.2%           
======================================
  Files          23      23           
  Lines        6469    6469           
======================================
  Hits         2020    2020           
  Misses       4449    4449           

Flag	Coverage Δ
rust	31.2% <0.0%> (ø)

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