Remove platform-req

- Add suport PHP7 and 8
- Add support Symfony3.x, 4.x and 5.x

Author: nanasess

composer.json

@@ -20,14 +20,14 @@
         "issues": "https://github.com/php5friends/phpunit48/issues"
     },
     "require": {
-        "php": ">=5.3.3",
+        "php": ">=5.3.3 || ^7 || ^8",
         "php5friends/php-file-iterator14": "~1.4.6",
         "phpunit/php-text-template": "~1.2",
         "phpunit/php-code-coverage": "~2.1",
         "phpunit/php-timer": "^1.0.6",
         "phpunit/phpunit-mock-objects": "~2.3",
         "phpspec/prophecy": "^1.3.1",
-        "symfony/yaml": "~2.1|~3.0",
+        "symfony/yaml": "^2.0 || ^3.0 || ^4.0 || ^5.0",
         "sebastian/comparator": "~1.2.4",
         "sebastian/diff": "~1.2",
         "sebastian/environment": "~1.3",
@@ -40,11 +40,6 @@
         "ext-spl": "*",
         "php5friends/global-state11": "~1.1.2"
     },
-    "config": {
-        "platform": {
-            "php": "5.3.3"
-        }
-    },
     "suggest": {
         "phpunit/php-invoker": "~1.1"
     },