v0.3.0

• Enhancements
  • Added mix tasks
    • mix nerves_hub.key export KEY_NAME - Export a firmware signing key
    • mix nerves_hub.user cert export - Export the current user certificate
  • Updated mix tasks
    • mix nerves_hub.firmware publish - Added ability to set firmware TTL by
      passing --ttl seconds.
  • Added environment variable NERVES_HUB_NON_INTERACTIVE for use with running
    nerves_hub_cli from non-interactive terminals such as CI. This answers y
    to all y/n prompts.
  • Allow passing binary public keys to config :nerves_hub, public_keys: [].