Added `@covers`-class information to *RuleTests #465

Job	Run time
Platform test (7.4)	2m 52s
Platform test (8.4)	3m 5s
Platform test (8.0)	2m 46s
Platform test (8.3)	2m 39s
Platform test (8.2)	2m 42s
Platform test (8.1)	3m 7s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 51s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 59s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 34s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 45s
	28m 20s

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