Add slug for categories table

[fznoviar]

No description provided.

[scrutinizer-notifier]

The inspection completed: 5 new issues, 3 updated code elements

[codecov-io]

Current coverage is 94.18%

Merging #183 into master will increase coverage by +0.49% as of 8a2dfb0

@@            master    #183   diff @@
======================================
  Files           46      46       
  Stmts         1333    1341     +8
  Branches         0       0       
  Methods        226     229     +3
======================================
+ Hit           1249    1263    +14
  Partial          0       0       
+ Missed          84      78     -6

Review entire Coverage Diff as of 8a2dfb0

---

Uncovered Suggestions

1. +1.19% via ...ports/CrawlerUrl.php#302...317
2. +0.82% via ...onCheckerCommand.php#47...57
3. +0.45% via .../CustomPresenter.php#17...22
4. See 7 more...

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