Release v0.3.0

What's Changed

• Use std::string_view by @Congyuwang in #33
• Create codeql.yml by @Congyuwang in #34
• Change on_connect API to send sender before calling start by @Congyuwang in #35
• Async recieve api by @Congyuwang in #36
• Add send_nonblock api by @Congyuwang in #37

Full Changelog: v0.2.2...v0.3.0