…n the work by @tazz4843. The reason I did not use his branch is that I wanted this to be based on embedded-hal-1.0.0. Since the signatures changed, this allowed for puttign all the methods in the same impl block and then feature gating them.

- information about async feature
- use of embedded-hal 1.0.0
- updated the example

…as async support.

fix clippy warnings