Handle DataForSEO bots

[gabrieljablonski]

DataForSEO is a crawler that is responsible for >50% of bot requests on a website I manage (>1.3M requests from a single IP address in the past few months), so handling it with legitbot seems like a good idea.

The bot specs are available here: https://dataforseo.com/dataforseo-bot

Let me know if any changes are needed.

[alaz]

Looks good to me. Thank you

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.75%. Comparing base (b4d6dce) to head (24ec3c3).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #157      +/-   ##
==========================================
+ Coverage   98.72%   98.75%   +0.02%     
==========================================
  Files          24       25       +1     
  Lines         235      240       +5     
==========================================
+ Hits          232      237       +5     
  Misses          3        3              

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