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Fastfile

lane :whats_news do
  require 'fastlane'
  require 'spaceship'

  email = "<YOUR EMAIL>"
  team_name = "<YOUR TEAM NAME>"
  bundle_id = "<YOUR BUNDLE ID>"
  locales = ["en-US"]

  Spaceship::ConnectAPI::Client.login(email, team_name: team_name)

  # Get app and app versions
  app = Spaceship::ConnectAPI::App.find(bundle_id)
  versions = app.get_app_store_versions.each do |version|

    # Get app localizations and print locale and whats new
    puts "== VERSION: #{version.version_string}"
    version.get_app_store_version_localizations().each do |localization|
      next unless locales.include?(localization.locale)

      puts "** LOCALE: #{localization.locale}"
      puts "\t#{localization.whats_new}"
    end

    puts ""
  end
end