v0.3.12

[hawkw]

0.3.12 (March 9, 2022)

• Avoid time operations that can panic (Avoid time operations that can panic #599)
• Bump MSRV to Rust 1.49 (Bump MSRV to 1.49, since Tokio uses it #606)
• Fix header decoding error when a header name is contained at a continuation
  header boundary (Not to consume buf when decoding non_huff header name(which consumes the buf) succeeded but header value failed (DecoderError::NeedMore) #589)
• Remove I/O type names from handshake tracing spans (tracing: remove I/O type names from handshake spans #608)