raise dependency on phpdocumentor/reflection-docblock 5.2

raise dependency on PHP 7.1.3
raise dependency on sebastian/version 2.0
raise dependency on nikic/php-parser 4.5
raise dependency on phpdocumentor/reflection-docblock 4.3
raise dependency on justinrainbow/json-schema 5.2
raise dependency on seld/jsonlint 1.4
add dependency on phpdocumentor/type-resolver 0.4
raise dependency on Symfony 4.4 and allow 5
switch to phpunit8

raise dependency on nikic/php-parser 3.1
raise dependency on doctrine/collections 1.4
add dependency on psr/log
allow Symfony 4
switch to phpunit7

This reverts commit 729c65c7cef3c67a092ef675d9d42e98b4e1593c.