Add recipe for symfony/requirements-checker 2.0

Author: jorrit

symfony/requirements-checker/2.0/manifest.json

@@ -0,0 +1,6 @@
+{
+    "composer-scripts": {
+        "requirements-checker": "script"
+    },
+    "aliases": ["requirement-check", "requirement-checker", "req-checker", "req-check", "req-checks"]
+}