raise dependency on PHP 7.2
raise dependency on phpdocumentor/reflection-docblock 5.0
raise dependency on sebastian/comparator 3.0
raise dependency on doctrine/instantiator 1.2
raise dependency on sebastian/recursion-context 3.0

allow phpdocumentor/reflection-docblock 5.0

allow sebastian/comparator 4 and sebastian/recursion-context 4

use range dependency on F27+