embedded-hal-1.0.0 migration

[pdgilbert]

From @rednez1337 's fork https://github.com/rednaz1337/ds18b20 I have made adjustments for embedded-hal-1.0.0-rc3 in a fork at https://github.com/pdgilbert/ds18b20 and tested with the git version of stm32f4xx_hal, which has rc3 thanks to @rursprung and @burrball. My main changes to ds18b20 are to use embedded_hal::delay::DelayNs; in several places and in Cargo.toml put

[dependencies]
one-wire-bus    = { git = "https://github.com/daniel-larsen/one-wire-bus" }
embedded-hal = {version="1.0.0-rc.3"}

which @daniel-larsen has updated for rc3.

FWIW, these may provide some pieces for the embedded-hal-1.0.0 jump.

Other device crates I have been checking are all using older embedded-hals thanks to stm32f4xx_hal 's magic dual support. This is the first complete embedded-hal-1.0.0-rc3 example I have been able to put together. (CI at https://github.com/pdgilbert/rust-integration-testing/actions)