v6.3.0

Added

• Connection pooling (HTTP/1.1 keep-alive) for h1_client (default).
• native-tls (default) and rustls feature flags.
  • Only works with h1_client.
• Isahc metrics as a response extension for curl_client.

Fixed

• Box<dyn HttpClient> no longer infinitely recurses.
• curl_client now always correctly reads the response body.
• hyper_client should now build correctly.
• WasmClient fetch from worker scope now works correctly.

Internal

• Improved CI