docs(README): update readme

Update README.md

fix(mistake): fix `Exec` function

add `Exec` function

docs(readme): update `gosh` examples and fix it

rename `shell` module to `gosh`, update README, bump go to `17`

update README

add new functions: `RunCmd`, `RunCmdOut`, and modify `RunOut` func

rename `SHCore` to `Run`, update README

update `https://api.github.com/repos/scmn-dev/secman/releases/latest` …

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