chore(readme): side effect of pinning version

[bruno-garcia]

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[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- side effect of pinning version ([#2230](https://github.com/getsentry/sentry-unity/pull/2230))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

Generated by 🚫 dangerJS against 8a80604

[bitsandfoxes]

Suggested change

	To use this specific version of the SDK, append `#3.2.3` to the URL, but note that this will stop Unity from suggesting version updates automatically.
	To use this specific version of the SDK, append `#3.2.3` to the URL, but note that this will require you to manually update by providing a new GIT URL.

Unity does not suggest updates when installing packages via GIT URL. But when you pin the version the update button does nothing. Without the added tag the button click will fetch the newest available version.