ChangelogCheck.swift

func checkChangelog() {
    let allSourceFiles = danger.git.modifiedFiles + danger.git.createdFiles

    let changelogChanged = allSourceFiles.contains("CHANGELOG.md")
    let sourceChanges = allSourceFiles.first(where: { $0.hasPrefix("Sources") })

    let isTrivial = (danger.github != nil) && danger.github.pullRequest.title.contains("#trivial")

    if !isTrivial, !changelogChanged, sourceChanges != nil {
        danger.warn("""
         Any changes to library code should be reflected in the Changelog.

         Please consider adding a note there and adhere to the [Changelog Guidelines](https://github.com/Moya/contributors/blob/master/Changelog%20Guidelines.md).
        """)
    }
}