v3.2.0

Features

• ssl: add method sendfile (Jianhui Zhao)
• http: support post formdata (Jianhui Zhao)
• bump version 3.2.0 (Jianhui Zhao)

Bug Fixes

• http: remove unused variable declaration (Jianhui Zhao)

Code Refactoring

• refactoring the coroutine switching process using yieldk (Jianhui Zhao)
• socket: use path instead fd as input parameter for sendfile (Jianhui Zhao)
• socket: do not return offset aim to simplify sendfile (Jianhui Zhao)

Performance Improvements

• http: invoke sendfile to send body with file (Jianhui Zhao)

Chores

• fix redefine variable (Jianhui Zhao)
• bufio: Canonical C function name (Jianhui Zhao)
• fix redefine variable (Jianhui Zhao)