trillium-client-v0.5.0

Other

• update dependencies other than trillium-rustls
• replace insert_default_header and remove_default_header with default_headers_mut and add default_headers
• client breaking: add default headers and make header access consistent
• introduce IntoUrl and Client::base
• remove ClientLike
• http patch reversion: set Server header before request again
• Avoid an unnecessary to_string() before formatting
• update tests
• client patch: spec compliance improvements
• client patch feature: add Conn::peer_addr