minor #1282 doc: v2 use PHP 8.0 (bchatard)
minor #1282 doc: v2 use PHP 8.0 (bchatard)

This PR was merged into the main branch.

Discussion
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doc: v2 use PHP 8.0

Update README, according to v2 change (see `composer.json`)

Commits
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e3d13ec doc: v2 use PHP 8.0

voronkovich/symfony-demo,TomasVotruba/symfony-demo,TomasVotruba/symfony-demo,voronkovich/symfony-demo,voronkovich/symfony-demo,TomasVotruba/symfony-demo