创建antdpro时，不选择antd@4会报错

[detonateyin]

What happens?

使用npm create umi时选择不用antd@4会报错

How To Reproduce

Steps to reproduce the behavior:

1. npm create umi
2. ? Select the boilerplate type-- Pick ant-design-pro
3. ? 🤓 Which language do you want to use?-- Pick JavaScript
4. ? 🦄 Time to use better, faster and latest antd@4! -- Pick No

Context

• Umi Version:v2.13.3
• Node Version:v12.16.1
• Create-umi Version:v0.20.1
• Platform:macOs v10.14.6

Log

? Select the boilerplate type ant-design-pro
? 🤓 Which language do you want to use? JavaScript
? 🦄 Time to use better, faster and latest antd@4! No
events.js:288
      throw er; // Unhandled 'error' event
      ^

TypeError: self.env.emit is not a function
    at /Users/xxxx/.npm/_npx/15815/lib/node_modules/create-umi/node_modules/yeoman-generator/lib/index.js:653:22
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
Emitted 'error' event on AntDesignProGenerator instance at:
    at Immediate.<anonymous> (/Users/xxxx/.npm/_npx/15815/lib/node_modules/create-umi/node_modules/yeoman-generator/lib/index.js:668:20)
    at processImmediate (internal/timers.js:456:21)

[newmann]

不管选不选，都报错

[detonateyin]

不管选不选，都报错

对，提完issue就发现了🤣

[sorrycc]

It's inactive above 3 months, feel free to reopen if still have problems.