Add link to Symfony implementation

[nicolas-grekas]

Once symfony/symfony#36042 is merged (should happen in the very next days.)

[harikt]

Hi @nicolas-grekas ,

I have a question : From https://github.com/symfony/uid

This Component is experimental.

When this component is marked experimental how can you make sure this will exists in the future ?

[nicolas-grekas]

Experimental means it's not covered by our BC promise, that's all - they won't be removed.

[harikt]

oh cool. Good to know. I was reading

In such cases, we prefer to gather feedback from real-world usage, adapt the API, or remove it altogether.

from https://symfony.com/doc/current/contributing/code/experimental.html and misunderstood it.

[nicolas-grekas]

Linked PR is now merged.

[nicolas-grekas]

Friendly ping @alizain

[larskoole]

Would be nice to get this merged. I use PHP so I opted for a package out of the list only to find out later that Symfony also has ULIDs with a binary implementation...