Update CVE-2020-7260 with acknowledgment

Acknowledgement added

2020/7xxx/CVE-2020-7260.json

@@ -36,6 +36,12 @@
             ]
         }
     },
+    "credit": [
+        {
+            "lang": "eng",
+            "value": "McAfee credits Pierre-Alexandre Braeken twitter: @pabraeken for responsibly disclosing this vulnerability to McAfee."
+        }
+    ],
     "data_format": "MITRE",
     "data_type": "CVE",
     "data_version": "4.0",
@@ -88,6 +94,6 @@
         ]
     },
     "source": {
-        "discovery": "INTERNAL"
+        "discovery": "EXTERNAL"
     }
 }