Roadmap

Here's a roadmap which I thought about `npm-to-yarn`.

`v3` - [feat: `npx` conversions #53 ](https://github.com/nebrelbug/npm-to-yarn/pull/53)
`v3.1.0` - [feat: multiple conversions #58 ](https://github.com/nebrelbug/npm-to-yarn/pull/58)
`v4` - [feat: new conversions #59 ](https://github.com/nebrelbug/npm-to-yarn/pull/59)