release_notes.rb

require "octokit"

Octokit.configure do |c|
  c.access_token = "YOUR_GITHUB_ACCESS_TOKEN",
  c.auto_paginate = true
end

# get all comments from all issues
comments = Octokit.issues_comments("DefactoSoftware/CAPP11")

# only select the ones that start with something like 'Release note:'
notes = comments.select do |comment| 
  comment.body.downcase.start_with?("release note")
end

# format them nicely
release_notes = notes.map do |n| 
  "#{n.updated_at.strftime("%F")}\n#{n.body} (#{n.user.login})\n#{"-" * 80}\n\n"
end

👍