v0.9.0

Added

• Handle child process exit, either terminating by signal, or exiting with non-zero status.
  Prematurely exited downloader child processes will mark the corresponding download as 'Failed'.
  Auto-retry can be added later.

Changed

• Allow pre-TLS 1.3 connections for the time being
• Update dependencies.

Full Changelog: v0.8.1...v0.9.0