Ke Wu

PR: [#155](https://github.com/eggjs/egg-bin/pull/155)

> Personally speaking, saving a special dist-tag to package.json doesn't seem a good idea to me. "beta" or "beta-2" can be acceptable, but what if "latest"? It could point to...

Let me try to get this straight. There are several popular npm packages that are not obey SEMVER rules, such as TypeScript ([read more](https://github.com/microsoft/TypeScript/issues/14116)), Runing `npm i typescript` and saving...

我在本地测试了下，没有问题的。可以提供完整的最小复现仓库看看。

> @gemwuu 尽快推进吧，这样后续我们就以开源主干为主开发了。 嗯，这两天会合并进去。