Update TensorFlow 2.0 test file (#342)

test/models.json

@@ -4469,7 +4469,7 @@
   {
     "type":   "tf",
     "target": "netron_issue_342.zip",
-    "source": "https://github.com/lutzroeder/netron/files/3914095/netron_issue_342.zip",
+    "source": "https://github.com/lutzroeder/netron/files/3918584/netron_issue_342.zip",
     "format": "TensorFlow Saved Model v1",
     "link":   "https://github.com/lutzroeder/netron/issues/342"
   },