do not restrict type (#237)

(cherry picked from commit 6a99922)

Author: hauner

openapi-processor-core/src/main/resources/mapping/v11/mapping.yaml.json

@@ -76,7 +76,6 @@
         },
         "format-code": {
           "description": "enable/disable code formatting.",
-          "type": "boolean",
           "default": false,
           "enum": [false, true, "google", "eclipse"]
         },