v6.4.2

What's Changed

• fix(plugin-webpack): compile 4 webpackRendererConfigs instead of N by @georgexu99 in #3101
• fix(cli): update --help command output by @erickzhao in #3335
• chore: undocument npm install -g by @erickzhao in #3314

Full Changelog: v6.4.1...v6.4.2