Release 0.1.0

Added

• Added server module
  • Added release file checking and serving
  • Added response signing
  • Added Config struct
  • Added Core struct
    • Added Core::new()
    • Added Core::latest_version()
    • Added Core::release_file()
    • Added Core::versions()
  • Added Axum struct
    • Added Axum::get_latest_version()
    • Added Axum::get_hash_for_version()
    • Added Axum::get_release_file()
    • Added Axum::sign_response()
• Added client module
  • Added update checking, downloading, verifying, and installing
  • Added Config struct
  • Added Updater struct
    • Added Updater::new()
    • Added Updater::deregister_action()
    • Added Updater::is_safe_to_update()
    • Added Updater::register_action()
    • Added Updater::set_status()
    • Added Updater::status()
    • Added Updater::subscribe()
• Added README documentation
• Added examples
• Added full unit, integration, and end-to-end tests