Custom format for changelog_from_git_commits about fastlane

[emoonadev]

Food the solution:

    changelog = changelog_from_git_commits(
      tag_match_pattern: "builds/iosbetaCaretaker/*",
      pretty: "- %s",
      merge_commit_filtering: "only_include_merges"
    )

    str1_markerstring = "/"
    str2_markerstring = "'"
    finalChangelog = "#{changelog[/#{str1_markerstring}(.*?)#{str2_markerstring}/m, 1].gsub('-', ' ').gsub('Fix', '• Fixed:').gsub('New', 'New:').gsub('Change', '• Changed:').gsub('Approve', '• Approved:')}\n"

    upload_to_testflight(changelog: finalChangelog)