Feat: sub generators.

[duncup]

Checklist

• [x] npm test passes
• [ ] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [ ] commit message follows commit guidelines

Affected core subsystem(s)

Description of change

chore: Add History file. feat: Add sub generators.

[duncup]

node 4, CI 过不去。用了以下语法。

`${}`

[duncup]

@thonatos 研究下还有没有必要兼容 node 4 ?