Update schema-bundle.js

Fix schema errors reported in #272. This will need to be tested by running a new schema bundle.

Author: ccoffin

schema/support/schema2markmap/schema-bundle.js

@@ -40,6 +40,7 @@ async function schemaBundle() {
                         "title": `CVE Record Format ${t} sub schema`,
                         "description": `CVE Record Format ${t} format`,
                         "definitions": cveSchemaBundle.definitions,
+                        "type": "object",
                         "properties": {
                         },
                         "additionalProperties": false