add amendment

Author: jan-ivar

amendments.json

@@ -12,6 +12,18 @@
       ],
       "status": "candidate",
       "id": 33
+    },
+    {
+      "description": "Validate TURN username and credentials",
+      "type": "correction",
+      "status": "candidate",
+      "difftype": "modify",
+      "id": 59,
+      "pr": 3050,
+      "tests": [
+        "webrtc/RTCConfiguration-iceServers.html"
+      ],
+      "testUpdates": "already-tested"
     }
   ],
   "apply-prohibited-gathering-1": [