Added ~4.0 version to Symfony components.

Author: tarlepp

.gitignore

@@ -1,3 +1,4 @@
+.idea
 /test/temp/
 /vendor/
 /composer.lock

composer.json

@@ -24,18 +24,18 @@
     },
     "require": {
         "php": ">=5.5",
-        "symfony/form": "~2.8|~3.0",
-        "symfony/console": "~2.8|~3.0"
+        "symfony/form": "~2.8|~3.0|~4.0",
+        "symfony/console": "~2.8|~3.0|~4.0"
     },
     "require-dev": {
         "beberlei/assert": "~2.1",
         "behat/behat": "~3.0",
         "friendsofphp/php-cs-fixer": "^1.10",
-        "symfony/finder": "~2.8|~3.0",
-        "symfony/framework-bundle": "~2.8|~3.0",
-        "symfony/validator": "~2.8|~3.0",
-        "symfony/yaml": "~2.8|~3.0",
+        "symfony/finder": "~2.8|~3.0|~4.0",
+        "symfony/framework-bundle": "~2.8|~3.0|~4.0",
+        "symfony/validator": "~2.8|~3.0|~4.0",
+        "symfony/yaml": "~2.8|~3.0|~4.0",
         "phpunit/phpunit": "^4.8",
-        "symfony/security": "~2.8|~3.0"
+        "symfony/security": "~2.8|~3.0|~4.0"
     }
 }