Add nakedret, unconvert, wastedassign, stylecheck and nolintlint linters to improve code readability - nakedret - https://github.com/alexkohler/nakedret - nakedret is a Go static analysis tool to find naked returns in functions greater than a specified function length. - unconvert - https://github.com/mdempsky/unconvert - Remove unnecessary type conversions - wastedassign - https://github.com/sanposhiho/wastedassign - wastedassign finds wasted assignment statements. - notlintlint - Reports ill-formed or insufficient nolint directives - stylecheck - https://staticcheck.io/docs/checks/#ST - keep style consistent - excluded: [ST1003 - Poorly chosen identifier](https://staticcheck.io/docs/checks/#ST1003) and [ST1005 - Incorrectly formatted error string](https://staticcheck.io/docs/checks/#ST1005)  | 
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| .. | ||
| default_branch.go | ||
| hook_post_receive.go | ||
| hook_pre_receive.go | ||
| hook_proc_receive.go | ||
| hook_verification.go | ||
| internal.go | ||
| internal_repo.go | ||
| key.go | ||
| mail.go | ||
| manager.go | ||
| manager_process.go | ||
| manager_unix.go | ||
| manager_windows.go | ||
| restore_repo.go | ||
| serv.go | ||
| ssh_log.go | ||