merge v3 into master

[codecov[bot]]

Codecov Report

Patch coverage: 33.63% and project coverage change: -8.43 :warning:

Comparison is base (02ccc5c) 41.20% compared to head (d5d4730) 32.77%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #209 +/- ## ========================================== - Coverage 41.20% 32.77% -8.43% ========================================== Files 24 5 -19 Lines 1978 656 -1322 ========================================== - Hits 815 215 -600 + Misses 916 389 -527 + Partials 247 52 -195 ``` | [Impacted Files](https://codecov.io/gh/FISCO-BCOS/go-sdk/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS) | Coverage Δ | | |---|---|---| | [client/config.go](https://codecov.io/gh/FISCO-BCOS/go-sdk/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS#diff-Y2xpZW50L2NvbmZpZy5nbw==) | `0.00% <0.00%> (ø)` | | | [client/json.go](https://codecov.io/gh/FISCO-BCOS/go-sdk/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS#diff-Y2xpZW50L2pzb24uZ28=) | `0.00% <0.00%> (ø)` | | | [client/parse\_pem.go](https://codecov.io/gh/FISCO-BCOS/go-sdk/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS#diff-Y2xpZW50L3BhcnNlX3BlbS5nbw==) | `31.52% <0.00%> (ø)` | | | [client/connection.go](https://codecov.io/gh/FISCO-BCOS/go-sdk/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS#diff-Y2xpZW50L2Nvbm5lY3Rpb24uZ28=) | `33.06% <33.06%> (ø)` | | | [client/go\_client.go](https://codecov.io/gh/FISCO-BCOS/go-sdk/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS#diff-Y2xpZW50L2dvX2NsaWVudC5nbw==) | `35.39% <37.59%> (-5.99%)` | :arrow_down: | ... and [10 files with indirect coverage changes](https://codecov.io/gh/FISCO-BCOS/go-sdk/pull/209/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS) Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS)

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