I write it because many of Go's web server are very lightweight so that they do not have the auto reloading function. It will be more convenient that we have a tool to stop the old process and start a new one after we saved some source code.
After searched and reviewed some similar solutions like that of Gulp and Grunt (many solutions are from NodeJS community), I think writing a universal command line tool with Go might be cool.
The advantages of this command is that it does not need any external dependencies and the precompiled binary can run directly on linux and macOS. It is useful not only for running dev server with `go run server.go` or `python server.py` but also when you want to rebuild your go project after any changes of source code. It is designed to be extremely simple and I have already been enjoying it during the development of itself!
Although it is lack of unit tests yet, I think it might be good for you to try it out now :)
