Update composer.json

Author: SinSquare

composer.json

@@ -5,14 +5,14 @@
     "type": "application",
     "require": {
         "php": "^5.6 || >=7.0",
-        "symfony/finder": "^3.0 || ^4.0",
-        "symfony/polyfill-php70": "^1.0",
-        "symfony/polyfill-php72": "^1.4",
-        "symfony/stopwatch": "^3.0 || ^4.0"
+        "symfony/finder": ">=4.0",
+        "symfony/polyfill-php70": ">=1.0",
+        "symfony/polyfill-php72": ">=1.4",
+        "symfony/stopwatch": ">=4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.0",
-        "friendsofphp/php-cs-fixer": "^2.0"
+        "phpunit/phpunit": ">=6.0",
+        "friendsofphp/php-cs-fixer": ">=2.0"
     },
     "autoload": {
         "psr-4": { "PhpDocFormatter\\": "src/" }