update: add versioning instructions

[cpaniaguam]

• Add versioning instructions to readme
• Update version to v0.4.2

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.64%. Comparing base (d37df4e) to head (8180e39).

❗ Current head 8180e39 differs from pull request most recent head f0eef4a. Consider uploading reports for the commit f0eef4a to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #364   +/-   ##
=======================================
  Coverage   90.64%   90.64%           
=======================================
  Files          29       29           
  Lines         951      951           
=======================================
  Hits          862      862           
  Misses         89       89           

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