Fixed for real this time

Description is not a specified property in the generated Schema and `"additionalProperties"` is set to `false` by default.

Author: richardhboyd

README.md

@@ -57,8 +57,7 @@ $ cat <<EOT > test.json
     "clientRequestToken": "ecba020e-b2e6-4742-a7d0-8a06ae7c4b2b",
     "desiredResourceState": {
       "Title": "This_Is_The_Title_For_My_Example",
-      "TestCode": "NOT_STARTED",
-      "Description": "bar"
+      "TestCode": "NOT_STARTED"
     },
     "previousResourceState": null,
     "logicalResourceIdentifier": null