Fix version for symfony components

Author: bruli

composer.json

@@ -30,9 +30,9 @@
         "mybuilder/phpunit-accelerator": "^1.1",
         "squizlabs/php_codesniffer": "~2.3",
         "phpmd/phpmd": "~2.2",
-        "symfony/dependency-injection": "~3.0",
-        "symfony/config": "~3.0",
-        "symfony/yaml": "~3.0",
+        "symfony/dependency-injection": ">=2.7,<=3.0.2",
+        "symfony/config": ">=2.7,<=3.0.2",
+        "symfony/yaml": ">=2.7,<=3.0.2",
         "fiunchinho/phpunit-randomizer": "~2.0",
         "seld/jsonlint": "1.3.*",
         "bruli/ignore-files": "~1.0"