Merge pull request #23 from php-http/phpunit

Allow PHPUnit 7.0

Author: Nyholm

composer.json

@@ -11,9 +11,9 @@
         }
     ],
     "require": {
-        "php": ">=5.4",
+        "php": "^5.4 || ^7.0",
         "psr/http-message": "^1.0",
-        "phpunit/phpunit": "^5.4|^6.0"
+        "phpunit/phpunit": "^5.4 || ^6.0 || ^7.0"
     },
     "require-dev": {
         "zendframework/zend-diactoros": "^1.0",