fix(deps): update dependency yeoman-generator to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
yeoman-generator	dependencies	major	^2.0.1 -> ^4.0.0	homepage, source

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Release Notes

yeoman/generator

### [`v4.0.1`](https://togithub.com/yeoman/generator/compare/v4.0.0...v4.0.1) [Compare Source](https://togithub.com/yeoman/generator/compare/v4.0.0...v4.0.1) ### [`v4.0.0`](https://togithub.com/yeoman/generator/releases/v4.0.0) [Compare Source](https://togithub.com/yeoman/generator/compare/v3.2.0...v4.0.0) #### Breaking - Officially supports Node >= 8 (dropped support for Node 6) - Install methods will be run 1 time per set of arguments. Previously we'd only run them once no matter the arguments, this prevented use case like different npm settings for more complicated setup with different targets (server/browser) [#​1108](https://togithub.com/yeoman/generator/issues/1108) ### [`v3.2.0`](https://togithub.com/yeoman/generator/releases/v3.2.0) [Compare Source](https://togithub.com/yeoman/generator/compare/v3.1.1...v3.2.0) Added a new optional syntax to use `composeWith`: ```js this.composeWith({ Generator: require('generator-x'), path: require.resolve('generator-x') }) ``` ### [`v3.1.1`](https://togithub.com/yeoman/generator/releases/v3.1.1) [Compare Source](https://togithub.com/yeoman/generator/compare/v3.1.0...v3.1.1) Fix some issues with `--force-install` not being detected properly from the command line arguments. ### [`v3.1.0`](https://togithub.com/yeoman/generator/releases/v3.1.0) [Compare Source](https://togithub.com/yeoman/generator/compare/v3.0.0...v3.1.0) Add `--force-install` flag which will cause the generator to throw if the installation phase fail. ### [`v3.0.0`](https://togithub.com/yeoman/generator/releases/v3.0.0) [Compare Source](https://togithub.com/yeoman/generator/compare/v2.0.5...v3.0.0) Maintenance release with a few breaking change that shouldn't impact most users. ##### Breaking - `mem-fs-editor` updated to latest release. A sub-dependency moved from `node-glob` to `fast-glob`, so some of the `this.fs` methods glob options will change. - Install methods: `npmInstall`, `bowerInstall`, `yarnInstall` and `installDependencies` do not return promises anymore. This behavior was confusing and a major source of bugs. To handle actions after the install might've run (if user didn't specify `--skip-install`), use the [`end` run loop phase](http://yeoman.io/authoring/running-context.html). - Renamed `runInstall` to `scheduleInstallTask` ##### New - For users of the Yeoman API: `generator.run()` now returns a promise as well as taking a callback (the callback will keep working for the foreseeable future as we need to maintains backward compatibility with older generators)

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