tutorial: update installation instructions to use nightly toolchain
@@ -78,7 +78,8 @@ First install Jujutsu:
```shell script
$ git clone https://github.com/martinvonz/jj.git jj-git
$ cd jj-git
-$ cargo install --path .
+$ rustup install nightly
+$ cargo +nightly install --path .
$ cd ..
```
