This is the gist for `new_changelog_item` bash script

new_changelog_item.sh

new_changelog_item()
{   
    while read line; do
    if [[ $line == "## [Unreleased]"* ]]; then
        newvar=$(<<<"$line" sed 's/[].*[]/\\&/g')
        echo $newvar
        echo "LINE FOUND IN" CHANGELOG.md
        sed -i "" "s/$newvar/## [Unreleased]\n\n## [$version] - $date\n### Added\n - ADD CHANGE HERE!/" CHANGELOG.md
        return
    fi

    done < CHANGELOG.md
}