I had to remove SwiftWasm 5.3 and 5.4 from CI because https://github.com/OpenCombine/OpenCombine/issues/225 is reproducible with all code, not just OpenCombine, with old toolchains when Xcode 13.1 is installed.

I've also updated `Example` code to try using `fetch` with `async`/`await` and a section with a simple guide for this to `README.md`

Node.js and npm dependencies together with webpack.js config in `Example` directory were also updated.

* Bump to v0.11.0, update `CHANGELOG.md` & `Example`

* Add simple `async`/`await` guide to `README.md`

* Use `wasm-5.5-SNAPSHOT-2021-11-20-a`

* Update `CHANGELOG.md`

* Update `.swift-version`

* Add acknowledgements to `CHANGELOG.md`