• Go 1.13 or greater is now required.
• In verbose mode, we now print a message before each HTTP request.
  Previously we would not print anything for retried requests.
• Expected response errors no longer cause request retries. For example, we
  no longer retry the download request if the database subscription has
  lapsed.
• When running with GEOIPUPDATE_FREQUENCY set, the Docker image will now
  stop when sent a SIGTERM instead of waiting for a SIGKILL. Pull request
  by Maxence POULAIN. GitHub #135.
• Docker images are now provided for ARM64. Requested by allthesebugsv2.
  GitHub #136.