Updated nix install command
@@ -31,7 +31,7 @@ Urbit uses [Nix][nix] to manage builds. On Linux and macOS you can install Nix
via:
```
-curl https://nixos.org/nix/install | sh
+curl -L https://nixos.org/nix/install | sh
```
The Makefile in the project's root directory contains useful phony targets for
