docs: add changelog to document recently changes

[kezhuw]

Closes #42.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.10%. Comparing base (5b8ba3b) to head (74c596c).

❗ Current head 74c596c differs from pull request most recent head e8200ae. Consider uploading reports for the commit e8200ae to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   84.93%   85.10%   +0.16%     
==========================================
  Files          34       34              
  Lines        4800     4800              
==========================================
+ Hits         4077     4085       +8     
+ Misses        723      715       -8     

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