Support nested arrow functions (#334) #343

Job	Run time
Test: PHP 5.5 on PHPCS 3.5.6	39s
Test: PHP 5.5 on PHPCS dev-master	27s
Test: PHP 5.6 on PHPCS 3.5.6	25s
Test: PHP 5.6 on PHPCS dev-master	22s
Test: PHP 7.0 on PHPCS 3.5.6	23s
Test: PHP 7.0 on PHPCS dev-master	15s
Test: PHP 7.1 on PHPCS 3.5.6	15s
Test: PHP 7.1 on PHPCS dev-master	15s
Test: PHP 7.2 on PHPCS 3.5.6	15s
Test: PHP 7.2 on PHPCS dev-master	16s
Test: PHP 7.3 on PHPCS 3.5.6	23s
Test: PHP 7.3 on PHPCS dev-master	22s
Test: PHP 8.3 on PHPCS 3.6.1	14s
Test: PHP 8.2 on PHPCS 3.6.1	15s
Test: PHP 8.1 on PHPCS dev-master	14s
Test: PHP 8.1 on PHPCS 3.6.1	15s
Test: PHP 8.0 on PHPCS dev-master	22s
Test: PHP 8.0 on PHPCS 3.5.7	14s
Test: PHP 7.4 on PHPCS dev-master	16s
Test: PHP 8.4 on PHPCS dev-master	24s
Coverage: PHP 8.3 on PHPCS dev-master	42s
Coverage: PHP 7.4 on PHPCS 3.5.6	46s
Coverage: PHP 5.4 on PHPCS dev-master	4m 14s
Coverage: PHP 5.4 on PHPCS 3.5.6	4m 38s
coveralls-finish	2s
	16m 53s

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