docs: update CONTRIBUTING.md

[lotyp]

Updated documentation to mention conventional commits

chore(ci): change release type from node to php

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.32%. Comparing base (943437e) to head (8275f0c).
Report is 1 commits behind head on 2.x.

❗ Current head 8275f0c differs from pull request most recent head 4002820. Consider uploading reports for the commit 4002820 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x     #191   +/-   ##
=========================================
  Coverage     95.32%   95.32%           
  Complexity     1856     1856           
=========================================
  Files           130      130           
  Lines          5136     5136           
=========================================
  Hits           4896     4896           
  Misses          240      240           

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