Release v0.2.9

What's Changed

• [struct_pack] add benchmark for zero-copy & varint by @poor-circle in #525
• [coro_http][feat]update coro_http_server by @qicosmos in #526
• [coro_http][demo]add chat room demo by @qicosmos in #528
• use fs path by @qicosmos in #529
• fix by @qicosmos in #530
• [coro_http_client][fix]correct ec by @qicosmos in #531
• [struct_pack][fix]add ID collsion compile-time check & doc. by @poor-circle in #532
• [strcut_xml][fix] fix parse Chinese text in xml by @qicosmos in #533
• [struct_pack] relax limitation for long type by @poor-circle in #535
• [coro_rpc][breakchange] enhance error handling by @poor-circle in #538
• fix code error by @982945902 in #539
• [coro_http_client][improve]Improve ssl by @qicosmos in #540
• [struct_pack][fix] fix bug of struct_pack::write by @poor-circle in #537
• [coro_rpc][breakchange] change err_code to 16bit by @poor-circle in #542
• [coro_rpc]Fix for clang by @qicosmos in #544
• [coro_rpc][fix] fix coro_rpc_server default constructor by @poor-circle in #545
• [coro_http_server][feat]Support multipart by @qicosmos in #549
• [struct_pack] enhance struct_pack::write/read/get_write_size by @poor-circle in #551
• [coro_http][improve]Remove shared ptr, improve request ssl by @qicosmos in #558
• [coro_rpc][fix] keep protocol compatible/use context::tag() instead o… by @poor-circle in #555
• [struct_paack][fix] fix size_info operator + & namespace by @poor-circle in #560
• [struct_pack][fix] fix benchmark by @poor-circle in #561
• [struct_pack][doc] fix cn api document by @poor-circle in #563
• [struct_pack][fix] fix undef macro __has_feature by @poor-circle in #564
• [coro_file][bug]Fix coro file by @qicosmos in #565
• [coro_htttp][feat]update coro_http by @qicosmos in #567
• update coro_http doc by @qicosmos in #568
• [no ci] fix doc by @qicosmos in #569
• [no ci]fix doc link by @qicosmos in #570
• [struct_pack][breakchange] use struct_pack::err_code instead of struct_pack::errc as return value by @poor-circle in #566
• [coro_http]update and fix by @qicosmos in #571
• [coro_io] add size() for channel by @poor-circle in #572
• [struct_xxx][improve]using namespace alias to simplify importing iguana by @qicosmos in #575
• [coro_http_server][feat]update coro_http server by @qicosmos in #578

Full Changelog: v0.2.8...v0.2.9