Fix README.md logo

[JackPGreen]

See hazelcast/hazelcast-cpp-client#1370

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.46%. Comparing base (8b15ae1) to head (319bb6a).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1565      +/-   ##
==========================================
+ Coverage   93.43%   93.46%   +0.03%     
==========================================
  Files         466      466              
  Lines       16628    16628              
  Branches     1350     1350              
==========================================
+ Hits        15536    15541       +5     
+ Misses        799      795       -4     
+ Partials      293      292       -1     

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