Update example in README to use v3

DeterminateSystems / nix-installer-action

The Github Action for the Determinate Nix Installer

GNU Lesser General Public License v2.1

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Closed ajaxbits closed 1 year ago

ajaxbits commented 1 year ago

Updates the README's usage example to reflect latest v3 release of the action.

(N/A) Tested changes against a test repository
[x] Added or updated relevant documentation (leave unchecked if not applicable)
[x] (If this PR is for a release) Updated README to point to the new tag (leave unchecked if not applicable)