Skip useless delta updates – send full payload instead

[FZambia]

If the size of delta patch is greater than full publication payload – skip sending delta, just use the full payload.

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 81.64%. Comparing base (c5fffda) to head (09caeab).

Files	Patch %	Lines
client.go	0.00%	12 Missing ⚠️
hub.go	75.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #388      +/-   ##
==========================================
- Coverage   81.66%   81.64%   -0.03%     
==========================================
  Files          40       40              
  Lines        7103     7100       -3     
==========================================
- Hits         5801     5797       -4     
  Misses        931      931              
- Partials      371      372       +1     

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