docs(readme): wrong url on LICENCE badge

[sylvainmetayer]

This is correcting a wrong url on the LICENCE badge in the README.

Checklist

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• Read the CONTRIBUTING document before submitting your PR.

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• Make sure that the change you propose is the smallest possible.
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• CHANGELOG entry added, if necessary, under UNRELEASED.
• CONTRIBUTORS entry added, if necessary.
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[CLAassistant]

All committers have signed the CLA.

[asbiin]

Thanks @sylvainmetayer !

[github-actions]

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