v0.55.0

What's Changed

• Update submodules by @sbSteveK in #361
• Migrate to dispatch queue on macos by @sbSteveK in #364

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: v0.54.3...v0.55.0