Add Symfony 4 example config

[red-smeg]

Info:

PR Submitted: #1454

Issue:

nginx config example does not support symfony 4.

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Expected behavior:

Default for symfony 3 but show a symfony 4 config option

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Reproduce:

Run a symfony 4 project with example symfony config.

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

Hi again 👋 we would like to inform you that this issue has been automatically closed 🔒 because it had not recent activity during the stale period. We really really appreciate your contributions, and looking forward for more in the future 🎈.