New features

🐦 Nostr strategy - A new connection strategy is now available using Nostr, a decentralized network protocol with many public relays.
Unified relay API - The BitTorrent, Nostr, and MQTT strategies now take relayUrls and relayRedundancy options, so there is shared terminology across strategies and a smaller configuration API. These strategies also expose a getRelaySockets() function that returns a map of URLs to WebSockets.
Bug fix: Action sender functions can now send empty strings
Torrent tracker failures are now logged with their URLs

Breaking changes

🌊 BitTorrent strategy
- trackerUrls has been renamed relayUrls
- trackerRedundancy has been renamed relayRedundancy
- getTrackers() has been renamed getRelaySockets()
📡 MQTT strategy
- brokerUrls has been renamed relayUrls
- brokerRedundancy has been renamed relayRedundancy