Advice in readme appears contradictory but is at least out of date

[jsoref]

This suggests using @v... notation:

publish-immutable-action/README.md

Lines 19 to 22 in 4bc8754

	Consumers of your action will then be able to specify that version to consume your action from the package, e.g.
	- `- uses: your-name/[email protected]`
	- `- uses: your-name/your-action@v1`

This suggests using @... notation (which triggers warnings from at least the github vs code integration):

publish-immutable-action/README.md

Line 54 in 4bc8754

uses: actions/[email protected]

This tag exists which means that at the very least instances of 0.0.3 should be replaced with 0.0.4:
https://github.com/actions/publish-immutable-action/releases/tag/v0.0.4