chg: Allow malware-sample as only attribute in file.

Author: Rafiot

objects/file/definition.json

@@ -16,7 +16,8 @@
     "sha512/256",
     "tlsh",
     "pattern-in-file",
-    "x509-fingerprint-sha1"
+    "x509-fingerprint-sha1",
+    "malware-sample"
   ],
   "attributes": {
     "md5": {
@@ -154,7 +155,7 @@
       ]
     }
   },
-  "version": 7,
+  "version": 8,
   "description": "File object describing a file with meta-information",
   "meta-category": "file",
   "uuid": "688c46fb-5edb-40a3-8273-1af7923e2215",