Add PHP 8 attributes support #36

Job	Run time
Run tests PHP 7.1 Symfony 3.* highest	1m 39s
Run tests PHP 7.1 Symfony 4.* highest	3m 49s
Run tests PHP 7.2 Symfony 3.* highest	3m 42s
Run tests PHP 7.2 Symfony 4.* highest	1m 34s
Run tests PHP 7.2 Symfony 5.* highest	1m 54s
Run tests PHP 7.3 Symfony 3.* highest	3m 40s
Run tests PHP 7.3 Symfony 4.* highest	1m 28s
Run tests PHP 7.3 Symfony 5.* highest	1m 51s
Run tests PHP 7.4 Symfony 3.* highest	3m 33s
Run tests PHP 7.4 Symfony 4.* highest	1m 23s
Run tests PHP 7.4 Symfony 5.* highest	1m 54s
Run tests PHP 8.0 Symfony 4.* highest	1m 47s
Run tests PHP 8.0 Symfony 5.* highest	3m 46s
Run tests PHP 8.1 Symfony 4.* highest	3m 36s
Run tests PHP 8.1 Symfony 5.* highest	1m 55s
Run tests PHP 8.1 Symfony 6.* highest	2m 8s
Run tests PHP 8.2 Symfony 4.* highest	3m 24s
Run tests PHP 8.2 Symfony 5.* highest	1m 25s
Run tests PHP 8.2 Symfony 6.* highest	1m 52s
Run tests PHP 7.1 Symfony 3.* lowest	3m 59s
	50m 19s

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