resolve issue #93

[nurzhan-saktaganov]

What has been done? Why? What problem is being solved?

• Add a pause between bucketsDiscovery requests (default is 10 ms), see Discovery: add a pause between requests #93

I didn't forget about (remove if it is not applicable):

• Changelog (see documentation for changelog format)

Related issues: #93

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 69.92%. Comparing base (775273c) to head (63a99f5).

Files with missing lines	Patch %	Lines
discovery.go	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
+ Coverage   69.88%   69.92%   +0.03%     
==========================================
  Files          13       13              
  Lines        1252     1260       +8     
==========================================
+ Hits          875      881       +6     
- Misses        328      331       +3     
+ Partials       49       48       -1     

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