Update README.md

[yyh0808]

Solve the problem of nebula graph logo image file display in night mode

[yixinglu]

LGTM

[wey-gu]

LGTM

[codecov-commenter]

Codecov Report

Merging #3436 (f08cb93) into master (d6f83f3) will increase coverage by 0.02%.
The diff coverage is 98.85%.

@@            Coverage Diff             @@
##           master    #3436      +/-   ##
==========================================
+ Coverage   85.24%   85.26%   +0.02%     
==========================================
  Files        1278     1278              
  Lines      119200   119267      +67     
==========================================
+ Hits       101608   101696      +88     
+ Misses      17592    17571      -21     

Impacted Files	Coverage Δ
src/common/utils/NebulaKeyUtils.h	80.68% <ø> (ø)
src/common/utils/Types.h	100.00% <ø> (ø)
src/storage/exec/GetPropNode.h	89.55% <87.50%> (-0.45%)	⬇️
src/common/memory/MemoryUtils.cpp	93.33% <100.00%> (+0.65%)	⬆️
src/common/utils/MetaKeyUtils.cpp	82.15% <100.00%> (+0.78%)	⬆️
src/common/utils/NebulaKeyUtils.cpp	94.51% <100.00%> (+0.31%)	⬆️
src/common/utils/test/MetaKeyUtilsTest.cpp	94.63% <100.00%> (+0.30%)	⬆️
src/kvstore/test/DiskManagerTest.cpp	99.19% <100.00%> (+0.21%)	⬆️
src/storage/CompactionFilter.h	78.50% <100.00%> (ø)
src/storage/exec/UpdateNode.h	79.95% <100.00%> (+0.04%)	⬆️
... and 31 more

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