Update 'Required' feild

Update 'Required' feild to match last commit

2791object.json

@@ -5,8 +5,8 @@
     "title": "Base type for all IEEE-2791 Objects",
     "description": "All IEEE-2791 object types must adhear to this type in order to be compliant with IEEE-2791 standard",
     "required": [
-        "ieee2791_id",
-        "ieee2791_spec_version",
+        "object_id",
+        "spec_version",
         "etag",
         "provenance_domain",
         "usability_domain",
@@ -129,7 +129,7 @@
             "readOnly": true,
             "format": "uri"
         },
-        "e-tag": {
+        "etag": {
             "type": "string",
             "description": "See https://tools.ietf.org/html/rfc7232#section-2.1 for full description. It is recommended that the ETag be deleted or updated if the object file is changed (except in cases using weak ETags in which the entirety of the change comprises a simple re-writing of the JSON).",
             "examples": [