chore: Bump version to 1.2.0 and update CHANGELOG.md

[nielsenko]

Prepare release

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.19%. Comparing base (b11216b) to head (bdc5890).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #346   +/-   ##
=======================================
  Coverage   91.19%   91.19%           
=======================================
  Files          98       98           
  Lines        3849     3849           
  Branches     1964     1964           
=======================================
  Hits         3510     3510           
  Misses        339      339           

Flag	Coverage Δ
relic_core	90.90% <ø> (ø)
relic_io	93.33% <ø> (ø)

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[marcelomendoncasoares]

LGTM! 🚀