Tell rustup to automatically use the nightly channel #91
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Since MCHPRS only compiles using rust nightly, it can ship a
rust-toolchain
file that will tell rustup to automatically switch to the nightly channel.This behavior is documented here:
https://rust-lang.github.io/rustup/overrides.html#the-toolchain-file
This also prevents you needing to provide instructions to add a manual override in the README.