Do not execute codecov in feature test(#145)

[doublnt]

You need to complete

• [x] unit tests and/or feature tests
• [x] documentation is changed or added

[codecov-io]

Codecov Report

Merging #160 into master will decrease coverage by 0.08%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
- Coverage   97.51%   97.42%   -0.09%     
==========================================
  Files          53       54       +1     
  Lines        2614     2525      -89     
  Branches      243       19     -224     
==========================================
- Hits         2549     2460      -89     
- Misses         39       51      +12     
+ Partials       26       14      -12

Flag	Coverage Δ
#unittest	97.42% <ø> (?)

Impacted Files	Coverage Δ
aliyun-net-sdk-core/Auth/KeyPairCredentials.cs
aliyun-net-sdk-core/Auth/RpcSignatureComposer.cs
aliyun-net-sdk-core/CommonRoaRequest.cs
...yun-net-sdk-core/Transform/AcsErrorUnmarshaller.cs
aliyun-net-sdk-core/Auth/BasicCredentials.cs
...et-sdk-core/Regions/DescribeEndpointServiceImpl.cs
...iyun-net-sdk-core/Transform/UnmarshallerContext.cs
aliyun-net-sdk-core/Auth/RoaSignatureComposer.cs
aliyun-net-sdk-core/RpcAcsRequest.cs
aliyun-net-sdk-core/CommonRequest.cs
... and 97 more

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