automate update of CHANGELOG when bumping version

[Remi-Gau]

see here for some starters: https://github.com/bids-standard/bids-specification/blob/c27f613c779ba75e35397576998ccf388cfb8943/.circleci/config.yml#L65

[Remi-Gau]

if (git log -1 --pretty=%s | grep Merge*) && (! git log -1 --pretty=%b | grep REL:) ; then
github_changelog_generator --user bids-standard --project bids-specification --token ${CHANGE_TOKEN} --output ~/build/CHANGES.md --base ~/build/src/pregh-changes.md --header-label "# Changelog" --no-issues --no-issues-wo-labels --no-filter-by-milestone --no-compare-link --pr-label "" --release-branch master
cat ~/build/CHANGES.md
mv ~/build/CHANGES.md ~/build/src/CHANGES.md
else
echo "Commit or Release, do nothing"
fi

[Remi-Gau]

closing for now because we can rely on the github generated release notes