Merge pull request #6 from pocky/symfony3

Allow rmiller/phpspec-extension to work with Symfony3

Author: pocky

composer.json

@@ -16,7 +16,7 @@
         "php":             ">=5.4",
         "behat/behat":     "~3.0,>=3.0.4",
         "phpspec/phpspec": "~2.0",
-        "symfony/process": "~2.1"
+        "symfony/process": "~2.1|~3.0"
     },
     "require-dev": {
         "rmiller/error-extension": "~0.1",