调用的开源库引用了github个人仓库，如果作者删除了仓库或者改成私人仓库，那么go mod tidy就会失败
以github.com/mitchellh/osext为例，作者因为某些原因删除了仓库，并给出了替代的官方仓库github.com/kardianos/osext
- 使用replace命令
go mod edit -replace [old git package]@[version]=[new git package]@[version] - go.mod文件中会新增一行
replace github.com/mitchellh/osext v0.0.0-20151018003038-5e2d6d41470f => github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0 - 此时使用 go mod tidy会报错
go: github.com/kardianos/[email protected] used for two different module paths (github.com/kardianos/osext and github.com/mitchellh/osext) - 增加一行去掉被替换仓库
exclude github.com/mitchellh/osext v0.0.0-20151018003038-5e2d6d41470f