Actualize changelog

[aik099]

• rephrase some of the entries to better explain what was done
• added PR numbers to each (when possible) entry
• added mentioned of other contributors

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.17%. Comparing base (7c811b7) to head (1b9d1c5).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #215   +/-   ##
=========================================
  Coverage     63.17%   63.17%           
  Complexity      208      208           
=========================================
  Files            10       10           
  Lines           687      687           
=========================================
  Hits            434      434           
  Misses          253      253           

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