Added validation package to thermite in staging (#92)

Author: sudhirvkumar

staging/thermite/psc-package.json

@@ -4,6 +4,7 @@
     "source": "https://github.com/purescript/package-sets.git",
     "depends": [
         "react-dom",
-        "thermite"
+        "thermite",
+        "validation"
     ]
 }