[doc] Update README.md (#273)

For the first run seems to be need generate configuration file.
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Daler 2022-08-17 20:13:17 +04:00 committed by GitHub
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@ -6,6 +6,7 @@
```
composer require --dev psalm/plugin-symfony
vendor/bin/psalm --init
vendor/bin/psalm-plugin enable psalm/plugin-symfony
```