[php] support guzzlehttp/guzzle ^7.0#11773

oprudkyi wants to merge 3 commits into

swagger-api:3.0.0swagger-api/swagger-codegen:3.0.0from

oprudkyi:fix/php-guzzlehttp-7oprudkyi/swagger-codegen:fix/php-guzzlehttp-7Copy head branch name to clipboard