Add Upgrading section to README.md (#598)

* Add Upgrading section to README.md

* Change upgrading note README.md

* Change upgrading section at README.md

Remove note.
Add explanation of which version will be installed.

* Use an h3 instead

* A bit less detail...

---------

Co-authored-by: Ana Hobden <operator@hoverbear.org>
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Miguel 2023-09-06 19:20:37 +01:00 committed by GitHub
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@ -95,6 +95,15 @@ $ curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/ni
$ NIX_BUILD_GROUP_NAME=nixbuilder ./nix-installer install linux-multi --nix-build-group-id 4000 $ NIX_BUILD_GROUP_NAME=nixbuilder ./nix-installer install linux-multi --nix-build-group-id 4000
``` ```
### Upgrading Nix
You can upgrade Nix (to the version specified [here](https://raw.githubusercontent.com/NixOS/nixpkgs/master/nixos/modules/installer/tools/nix-fallback-paths.nix)) by running:
```
sudo nix upgrade-nix
```
Alternatively, you can [uninstall](#uninstalling) and [reinstall](#usage) with a different version of the `nix-installer`.
### Uninstalling ### Uninstalling