v1.0.0

Added

• Initial release of the official Rust client for the Ipregistry API.
• Single IP lookup (Client::lookup), origin lookup (Client::lookup_origin),
  and batch lookup (Client::lookup_batch) with per-entry results, transparent
  chunking beyond the API's 1024-address limit, and bounded concurrency.
• User-Agent parsing (Client::parse_user_agents) and the is_bot helper.
• Per-request options: reverse-DNS hostname resolution, field selection, and
  arbitrary query parameters.
• Pluggable response caching via the Cache trait, with a built-in
  thread-safe InMemoryCache (LRU + TTL).
• Automatic retries with exponential backoff for transient network errors and
  5xx responses; opt-in retries on 429 honoring Retry-After.
• Typed errors: Error (API / transport / decode), ApiError, and
  ErrorCode.
• TLS via rustls by default, with an optional native-tls feature.