relax phpcr-utils dependency on phpcr

Author: dbu

composer.json

@@ -25,7 +25,7 @@
     ],
     "require": {
         "php": ">=5.3.0",
-        "phpcr/phpcr": "2.1.0-beta8",
+        "phpcr/phpcr": "~2.1.0-beta8",
         "symfony/console": ">=2.0.0,<2.3.0-dev"
     },
     "autoload": {