Fix requirements, fixes #32

Author: Seldaek

composer.json

@@ -17,13 +17,13 @@
     ],
     "require": {
         "php": ">=5.3.2",
-        "symfony/monolog-bridge": "~2.2",
-        "symfony/dependency-injection": "~2.2",
-        "symfony/config": "~2.2",
+        "symfony/monolog-bridge": "~2.2-BETA2",
+        "symfony/dependency-injection": "~2.2-BETA2",
+        "symfony/config": "~2.2-BETA2",
         "monolog/monolog": "~1.3"
     },
     "require-dev": {
-        "symfony/yaml": "~2.2"
+        "symfony/yaml": "~2.2-BETA2"
     },
     "autoload": {
         "psr-0": { "Symfony\\Bundle\\MonologBundle": "" }