Add modified stub for ReadableCollection from doctrine/collections 1.x #164

Job	Run time
Platform test (7.4)	3m 14s
Platform test (8.0)	3m 1s
Platform test (8.1)	3m 1s
Platform test (8.2)	3m 11s
Platform test (8.3)	3m 12s
Platform test (8.4)	3m 18s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 46s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 57s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 49s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	3m 3s
	30m 32s

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