docs: update readme and npm badges

[AllanZhengYP]

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[codecov-io]

Codecov Report

Merging #1794 (60fea33) into master (de75f7e) will decrease coverage by 1.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1794      +/-   ##
==========================================
- Coverage   79.77%   78.74%   -1.04%     
==========================================
  Files         325      364      +39     
  Lines       12087    15322    +3235     
  Branches     2553     3337     +784     
==========================================
+ Hits         9643    12065    +2422     
- Misses       2444     3257     +813     

Impacted Files	Coverage Δ
protocol_tests/aws-json/models/models_0.ts	79.36% <0.00%> (-20.64%)	⬇️
protocol_tests/aws-restjson/models/models_0.ts	89.43% <0.00%> (-10.57%)	⬇️
...tocol_tests/aws-restxml/commands/XmlMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...col_tests/aws-restjson/commands/JsonMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
... and 180 more

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