Update Yii Logo in README.md.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Tests pass?	❌

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a945d86) to head (271f97e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #336   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        46        46           
===========================================
  Files             13        13           
  Lines            483       483           
===========================================
  Hits             483       483           

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