Release 0.3.7

What's Changed

• [metric][fix] replace static class with singleton by @qicosmos in #730
• [metric][feat]Improve counter by @qicosmos in #731
• [coro_io] rename channel to load_blancer, rename coro_channel to channel by @poor-circle in #732
• [metric][fix]System metric by @qicosmos in #733
• [metric]Fix summary by @qicosmos in #736
• rename moodycamel namespace by @poor-circle in #737
• [breakchange][feat] async_upload support offset by @poor-circle in #739
• [metric]Refact metric by @qicosmos in #740
• [struct_pack][feat] support user-define global config by @poor-circle in #741
• [metric]Fix and improve by @qicosmos in #743
• [struct_pack][fix] fix compile error in msvc by @poor-circle in #745
• [metric][feat]Improve metric some by @qicosmos in #746
• [coro_http_client][fix]chunked and multipart also clean out buf by @qicosmos in #747
• [easylog][fix] fix compile error in freeBSD by @poor-circle in #749
• [struct_pack][fix] fix warning by @poor-circle in #750
• [struct_pack][fix] fix compiler detect in msvc by @poor-circle in #751
• [metric]fix stat system metric by @qicosmos in #752
• [struct_pack][fix] fix freebsd by @poor-circle in #753
• [metric][bench and fix]add bench and fix by @qicosmos in #755
• [metric]Fix compile for msvc by @qicosmos in #756
• [cmake]remove link libstdc++fs by @qicosmos in #757
• [metric][benchmark]Add more benchmark by @qicosmos in #759

Full Changelog: 0.3.6...0.3.7