Release v0.28.0

What's Changed

• Nostr sdk book pages by @w3irdrobot in #245
• Verify unsigned event ids by @benthecarman in #255
• sdk: add ClientZapper by @yukibtc in #257
• build(deps): bump h2 from 0.3.23 to 0.3.24 by @dependabot in #256
• Reduce WASM size by @yukibtc in #259
• nostr: use url in std and url-fork in no_std by @yukibtc in #260
• nostr: add support to uppercase single-letter tags by @yukibtc in #261
• Make nostr-sdk signing events public by @benthecarman in #263
• Improve negentropy reconciliation by @yukibtc in #265
• Updates to remaining NWC extensions by @benthecarman in #207
• Add Relay Service Flags by @yukibtc in #269
• Add support to NIP59 by @yukibtc in #157
• Add Sealed Direct messages support by @yukibtc in #270
• sdk: allow to send/get msgs and events to/from specific relays by @yukibtc in #273
• sdk: move relay module to nostr-sdk-pool crate by @yukibtc in #280
• Add encrypted tag kind by @benthecarman in #281
• Improve ClientSigner by @yukibtc in #282
• Bump async-utility to v0.2.0 and async-wsocket to v0.3.0 by @yukibtc in #283
• sqlite: bump rusqlite to v0.30 by @yukibtc in #284
• pool: add Relay::send_req method by @yukibtc in #285
• build(deps): bump shlex from 1.2.0 to 1.3.0 by @dependabot in #286
• Add POW difficulty check for received events by @yukibtc in #287
• database: use LruCache instead of HashMap in MemoryDatabase by @yukibtc in #288
• Rename ClientSigner to NostrSigner by @yukibtc in #289
• database: extend kind-author indexes support by @yukibtc in #290
• nostr: add PublicKey and SecretKey structs by @yukibtc in #295
• Add support to NIP49 by @yukibtc in #296
• Zapper by @yukibtc in #297

Full Changelog: v0.27.0...v0.28.0