More useful 404 page

[KeJunMao]

Is your feature request related to a problem? Please describe. 一个试验性的功能，404 页面将会有一个友好的提示是不是要找xx软件。 Describe the solution you'd like 当我输入 get.js.org/chromes ( 比 chrome 多一个 s )，浏览器会告诉我 404 ，但我们可以询问用户是不是要找 chrome 。 Describe alternatives you've considered 采用字符串对比算法，大于某个阀值时告诉用户。 Additional context

[KeJunMao]

在这个分支可以试用该功能：https://github.com/hxco/Get/tree/404idea

注意，这是试验性的，也许会出现意想不到的问题。

[hifocus]

This is a great idea. Should be considered as a main feature in the future. And if so, we don't have to create so many alias to support the users.

Also, the alias system can be merged in.