fixed codeblock in UPGRADE-3.1.md
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@ -45,6 +45,7 @@ Yaml
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```php
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Yaml::dump(array('foo' => new A(), 'bar' => 1), 0, 0, false, Yaml::DUMP_OBJECT);
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```
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* The `!!php/object` tag to indicate dumped PHP objects has been deprecated
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and will be removed in Symfony 4.0. Use the `!php/object` tag instead.
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