[CHORE]: Update PR template to remind about CHANGELOG entry

[kindoflew]

IMPORTANT: Please read the README before submitting pull requests for this project. Additionally, if your PR closes any open GitHub issue, make sure you include Closes #XXXX in your comment.

Description:

This PR adds a checkbox reminding the contributor to create a CHANGELOG entry.

I will abide by the code of conduct.

[codecov[bot]]

Codecov Report

Merging #87 (b7e7e68) into main (efcc269) will not change coverage. The diff coverage is n/a.

:exclamation: Current head b7e7e68 differs from pull request most recent head 3167dca. Consider uploading reports for the commit 3167dca to get more accurate results

@@           Coverage Diff           @@
##             main      #87   +/-   ##
=======================================
  Coverage   98.26%   98.26%           
=======================================
  Files          25       25           
  Lines         462      462           
=======================================
  Hits          454      454           
  Misses          8        8           

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