Update docs README.md

[hailin0]

• Update docs/README.md

[codecov]

Codecov Report

Merging #5895 (b5de1ae) into master (b39c430) will decrease coverage by 7.46%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #5895      +/-   ##
============================================
- Coverage     51.20%   43.73%   -7.47%     
+ Complexity     3479     2769     -710     
============================================
  Files          1662     1659       -3     
  Lines         35660    35608      -52     
  Branches       3905     3908       +3     
============================================
- Hits          18258    15573    -2685     
- Misses        16491    19118    +2627     
- Partials        911      917       +6     

Impacted Files	Coverage Δ	Complexity Δ
...kywalking/oap/server/core/storage/AbstractDAO.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...ng/oap/server/core/analysis/config/NoneStream.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...server/storage/plugin/influxdb/base/RecordDAO.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-6.00%)
...er/storage/plugin/influxdb/base/NoneStreamDAO.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-4.00%)
...erver/storage/plugin/elasticsearch/base/EsDAO.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-4.00%)
...storage/plugin/influxdb/base/InfluxStorageDAO.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-5.00%)
...rage/plugin/influxdb/base/InfluxInsertRequest.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-8.00%)
...storage/plugin/elasticsearch/base/RecordEsDAO.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...torage/plugin/elasticsearch/base/MetricsEsDAO.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-5.00%)
...torage/plugin/elasticsearch/base/StorageEsDAO.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-5.00%)
... and 148 more

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