v0.39.0

What's Changed

• Update Rust crate async-trait to 0.1.56 by @renovate in #120
• Update Rust crate tokio to 1.19 by @renovate in #121
• Update Rust crate tokio-stream to 0.1.9 by @renovate in #122
• Socket mode error handling updates by @abdolence in #126

Full Changelog: v0.38.0...v0.39.0