Fix json for high-chart

[fznoviar]

No description provided.

[codecov-io]

Current coverage is 94.86%

Merging #187 into master will increase coverage by +0.61% as of 6d7498a

@@            master    #187   diff @@
======================================
  Files           46      46       
  Stmts         1357    1363     +6
  Branches         0       0       
  Methods        230     232     +2
======================================
+ Hit           1279    1293    +14
  Partial          0       0       
+ Missed          78      70     -8

Review entire Coverage Diff as of 6d7498a

---

Uncovered Suggestions

1. +1.17% via ...ports/CrawlerUrl.php#302...317
2. +0.81% via ...onCheckerCommand.php#47...57
3. +0.44% via .../CustomPresenter.php#17...22
4. See 7 more...

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[scrutinizer-notifier]

The inspection completed: 4 new issues, 2 updated code elements