Make readgroup a required property

transfer_schema.json

@@ -13,11 +13,12 @@
             "description": "FileTag object, required for Files",
             "type": "object",
             "required": [
-                "readtype"
+                "readtype",
+                "readgroup"
             ],
+            "additionalProperties": false,
             "properties": {
                 "readtype": {
-                    "type": "string",
                     "enum": [
                         "forward",
                         "reverse",
@@ -51,7 +52,6 @@
                     "$ref": "#/definitions/Name"
                 },
                 "tags": {
-                    "description": "The tags that belong to this file",
                     "$ref": "#/definitions/FileTag"
                 }
             }