message: Add Google Correlate.
  Sources:
diff: [
  + {
  + "dateClose": "2019-12-15",
  + "dateOpen": "2011-05-25",
  + "description": "Google Correlate was a service that provided users information about how strongly the frequency of multiple search terms correlates with each other over a specified time interval.",
  + "link": "https://de.wikipedia.org/wiki/Google_Correlate",
  + "name": "Google Correlate",
  + "type": "service"
  + },
  {
  "dateClose": "2019-09-18",
  "dateOpen": "2017-08-07",
  