message: Add commas that were missing in graveyard.json. JSON file valid again.
diff: "link": "https://en.wikipedia.org/wiki/Google_Cloud_Messaging",
  "name": "Google Cloud Messaging (GCM)",
  "type": "service"
  - }
  + },
  {
  "dateClose": "2019-10-31",
  "dateOpen": "2013-03-15",
  "link": "https://arstechnica.com/gadgets/2019/01/the-great-google-hangouts-shutdown-begins-october-2019/",
  "name": "Google Hangouts",
  "type": "service"
  - }
  + },
  {
  "dateClose": "2019-01-15",
  "dateOpen": "2013-03-19",
  