title: Can't get "generate summary report" to work in Clockify Api
body: <p>I've been trying to generate a report with the Clockify api, and I've been following the <a href="https://clockify.github.io/clockify_api_docs/#tag-Summary-report" rel="nofollow noreferrer">official documentation</a>. First I tried with my own data, but after trial and error, I started even trying the default data. No luck either. According to the documentation, this should work:</p>
  
  <pre><code>   curl -X POST -H 'X-Api-Key: {apikey}' -H 'content-type: application/json' -d '{
      "startDate": "2018-06-18T00:00:00.000Z",
      "endDate": "2018-06-24T23:59:59.999Z",
      "me": "false",
      "userGroupIds": "[]",
      "userIds": "[]",
      "projectIds": "[]",
      "clientIds": "[]",
      "taskIds": "[]",
      "tagIds": "[]",
      "billable": "BOTH",
      "includeTimeEntries": "true",
      "zoomLevel": "week",
      "description": "",
      "archived": "Active",
      "roundingOn": "false"
      }' -v -i 
   'https://api.clockify.me/api/workspaces/{workspace}/reports/summary/'
  </code></pre>
  
  <p>But it doesn't. The response will be:</p>
  
  <pre><code>{
    "message": "Could not read document: Can not deserialize instance of java.util.ArrayList out of VALUE_STRING token\n at [Source: java.io.PushbackInputStream@4a679880; line: 5, column: 19] (through reference chain: com.clockify.adapter.http.summaryReport.GetSummaryReportRequest[\"userGroupIds\"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of VALUE_STRING token\n at [Source: java.io.PushbackInputStream@4a679880; line: 5, column: 19] (through reference chain: com.clockify.adapter.http.summaryReport.GetSummaryReportRequest[\"userGroupIds\"])",
    "code": 3002
  }
  </code></pre>
  
  <p>I don't know what I'm doing wrong, so any help would be much appreciated.</p>