Tell rustup to automatically use the nightly channel (#91)

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.
MCHPR · Oct 23, 2022 · 47f6b24 · 47f6b24
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diff --git a/README.md b/README.md
@@ -29,7 +29,6 @@ If the Rust compiler is not already installed, you can find out how [on their of
 ```shell
 git clone https://github.com/MCHPR/MCHPRS.git
 cd MCHPRS
-rustup override set nightly
 cargo build --release
 ```
 

diff --git a/rust-toolchain b/rust-toolchain
@@ -0,0 +1 @@
+nightly