v0.30.0

What's Changed

• Update submodules by @sfod in #705
• Migrate to dispatch queue on macos by @sfod in #706

With the update to aws-c-io v0.24.0 macOS will now use Apple's Dispatch Queue, Network Framework, and Secitem to handle network connections and TLS negotiation.

Full Changelog: v0.29.2...v0.30.0